Common Weakness Enumeration

CWE-601

Allowed

URL Redirection to Untrusted Site ('Open Redirect')

Abstraction: Base · Status: Draft

The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.

2312 vulnerabilities reference this CWE, most recent first.

GHSA-3WQV-4HQ2-7GCP

Vulnerability from github – Published: 2025-06-06 15:30 – Updated: 2026-04-01 18:35
VLAI
Details

URL Redirection to Untrusted Site ('Open Redirect') vulnerability in CRM Perks WP Gravity Forms Salesforce allows Phishing. This issue affects WP Gravity Forms Salesforce: from n/a through 1.4.7.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2025-30953"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-06T13:15:36Z",
    "severity": "MODERATE"
  },
  "details": "URL Redirection to Untrusted Site (\u0027Open Redirect\u0027) vulnerability in CRM Perks WP Gravity Forms Salesforce allows Phishing. This issue affects WP Gravity Forms Salesforce: from n/a through 1.4.7.",
  "id": "GHSA-3wqv-4hq2-7gcp",
  "modified": "2026-04-01T18:35:20Z",
  "published": "2025-06-06T15:30:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-30953"
    },
    {
      "type": "WEB",
      "url": "https://patchstack.com/database/wordpress/plugin/gf-salesforce-crmperks/vulnerability/wordpress-wp-gravity-forms-salesforce-1-4-7-open-redirection-vulnerability?_s_id=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-3WRJ-CC82-VWX4

Vulnerability from github – Published: 2026-03-11 03:31 – Updated: 2026-03-11 03:31
VLAI
Details

Adobe Commerce versions 2.4.9-alpha3, 2.4.8-p3, 2.4.7-p8, 2.4.6-p13, 2.4.5-p15, 2.4.4-p16 and earlier are affected by a URL Redirection to Untrusted Site ('Open Redirect') vulnerability. An attacker could leverage this vulnerability to redirect users to malicious websites. Exploitation of this issue requires user interaction.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2026-21295"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-11T03:15:54Z",
    "severity": "LOW"
  },
  "details": "Adobe Commerce versions 2.4.9-alpha3, 2.4.8-p3, 2.4.7-p8, 2.4.6-p13, 2.4.5-p15, 2.4.4-p16 and earlier are affected by a URL Redirection to Untrusted Site (\u0027Open Redirect\u0027) vulnerability. An attacker could leverage this vulnerability to redirect users to malicious websites. Exploitation of this issue requires user interaction.",
  "id": "GHSA-3wrj-cc82-vwx4",
  "modified": "2026-03-11T03:31:28Z",
  "published": "2026-03-11T03:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21295"
    },
    {
      "type": "WEB",
      "url": "https://helpx.adobe.com/security/products/magento/apsb26-05.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-3XGQ-MGC9-7WQX

Vulnerability from github – Published: 2023-06-02 18:30 – Updated: 2024-04-04 04:30
VLAI
Details

Using a redirect embedded into sourceMappingUrls could allow for navigation to external protocol links in sandboxed iframes without allow-top-navigation-to-custom-protocols. This vulnerability affects Firefox for Android < 112, Firefox < 112, and Focus for Android < 112.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2023-29540"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-06-02T17:15:12Z",
    "severity": "MODERATE"
  },
  "details": "Using a redirect embedded into \u003ccode\u003esourceMappingUrls\u003c/code\u003e could allow for navigation to external protocol links in sandboxed iframes without \u003ccode\u003eallow-top-navigation-to-custom-protocols\u003c/code\u003e. This vulnerability affects Firefox for Android \u003c 112, Firefox \u003c 112, and Focus for Android \u003c 112.",
  "id": "GHSA-3xgq-mgc9-7wqx",
  "modified": "2024-04-04T04:30:42Z",
  "published": "2023-06-02T18:30:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-29540"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1790542"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2023-13"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-3XVP-FCXR-3MVQ

Vulnerability from github – Published: 2022-05-24 17:03 – Updated: 2024-04-04 02:42
VLAI
Details

A spoofing vulnerability exists in Visual Studio Live Share when a guest connected to a Live Share session is redirected to an arbitrary URL specified by the session host, aka 'Visual Studio Live Share Spoofing Vulnerability'.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2019-1486"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2019-12-10T22:15:00Z",
    "severity": "MODERATE"
  },
  "details": "A spoofing vulnerability exists in Visual Studio Live Share when a guest connected to a Live Share session is redirected to an arbitrary URL specified by the session host, aka \u0027Visual Studio Live Share Spoofing Vulnerability\u0027.",
  "id": "GHSA-3xvp-fcxr-3mvq",
  "modified": "2024-04-04T02:42:33Z",
  "published": "2022-05-24T17:03:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-1486"
    },
    {
      "type": "WEB",
      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1486"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-4298-89HC-6RFV

Vulnerability from github – Published: 2021-08-09 20:44 – Updated: 2024-09-20 17:59
VLAI
Summary
Open Redirect in Flask-User
Details

This affects all versions of package Flask-User. When using the make_safe_url function, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple backslashes such as /////evil.com/path or \\\evil.com/path. This vulnerability is only exploitable if an alternative WSGI server other than Werkzeug is used, or the default behaviour of Werkzeug is modified using autocorrect_location_header=False.

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "Flask-User"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.0.2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-23401"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-07-06T15:45:36Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "This affects all versions of package Flask-User. When using the `make_safe_url` function, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple backslashes such as `/////evil.com/path` or `\\\\\\evil.com/path`. This vulnerability is only exploitable if an alternative WSGI server other than Werkzeug is used, or the default behaviour of Werkzeug is modified using `autocorrect_location_header=False`.",
  "id": "GHSA-4298-89hc-6rfv",
  "modified": "2024-09-20T17:59:20Z",
  "published": "2021-08-09T20:44:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-23401"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-4298-89hc-6rfv"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/lingthio/Flask-User"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lingthio/Flask-User/blob/master/flask_user/user_manager__utils.py"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/flask-user/PYSEC-2021-337.yaml"
    },
    {
      "type": "WEB",
      "url": "https://snyk.io/vuln/SNYK-PYTHON-FLASKUSER-1293188"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Open Redirect in Flask-User"
}

GHSA-42P8-6358-Q3GJ

Vulnerability from github – Published: 2022-05-14 01:13 – Updated: 2022-05-14 01:13
VLAI
Details

qTest Portal in QASymphony qTest Manager 9.0.0 has an Open Redirect via the /portal/loginform redirect parameter.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2018-15180"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2019-04-02T17:29:00Z",
    "severity": "MODERATE"
  },
  "details": "qTest Portal in QASymphony qTest Manager 9.0.0 has an Open Redirect via the /portal/loginform redirect parameter.",
  "id": "GHSA-42p8-6358-q3gj",
  "modified": "2022-05-14T01:13:32Z",
  "published": "2022-05-14T01:13:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-15180"
    },
    {
      "type": "WEB",
      "url": "https://drive.google.com/file/d/0B60g8JcPElCCNHd1R2pPNzVGdy1ITjIza1VubWlUekoyNGhR/view"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-42V8-4P4G-32VH

Vulnerability from github – Published: 2022-12-29 21:30 – Updated: 2023-01-06 00:30
VLAI
Details

There is an unvalidated redirect vulnerability in Esri Portal for ArcGIS 11 and below that may allow a remote, unauthenticated attacker to craft a URL that could redirect a victim to an arbitrary website, simplifying phishing attacks.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2022-38208"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-12-29T20:15:00Z",
    "severity": "MODERATE"
  },
  "details": "There is an unvalidated redirect vulnerability in Esri Portal for ArcGIS 11 and below that may allow a remote, unauthenticated attacker to craft a URL that could redirect a victim to an arbitrary website, simplifying phishing attacks.",
  "id": "GHSA-42v8-4p4g-32vh",
  "modified": "2023-01-06T00:30:18Z",
  "published": "2022-12-29T21:30:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-38208"
    },
    {
      "type": "WEB",
      "url": "https://www.esri.com/arcgis-blog/products/trust-arcgis/administration/portal-for-arcgis-security-2022-update-2-patch-is-now-available"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-437J-5QC3-C589

Vulnerability from github – Published: 2022-06-30 00:00 – Updated: 2022-07-08 17:05
VLAI
Summary
Open Redirect in microweber
Details

Open Redirect in GitHub repository microweber/microweber prior to 1.2.19.

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "microweber/microweber"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.19"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2022-2252"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2022-07-05T22:17:26Z",
    "nvd_published_at": "2022-06-29T16:15:00Z",
    "severity": "MODERATE"
  },
  "details": "Open Redirect in GitHub repository microweber/microweber prior to 1.2.19.",
  "id": "GHSA-437j-5qc3-c589",
  "modified": "2022-07-08T17:05:12Z",
  "published": "2022-06-30T00:00:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-2252"
    },
    {
      "type": "WEB",
      "url": "https://github.com/microweber/microweber/commit/187e949daf7dea6f10b80da70988f0f86444eeff"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/microweber/microweber"
    },
    {
      "type": "WEB",
      "url": "https://huntr.dev/bounties/4d394bcc-a000-4f96-8cd2-8c565e1347e8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Open Redirect in microweber"
}

GHSA-43FC-V873-QW85

Vulnerability from github – Published: 2026-07-08 20:30 – Updated: 2026-07-08 20:30
VLAI
Summary
Waku has an Open Redirect via `unstable_redirect` Helper
Details

Summary

The unstable_redirect() helper exported from waku/router/server (packages/waku/src/router/define-router.tsx:156–161) accepts an arbitrary string and reflects it unchanged into the HTTP Location response header with no URL validation, scheme restriction, or path-only enforcement. Any application that passes user-controlled input to this helper — the natural pattern documented in the JSDoc and official fixtures — is vulnerable to open redirect attacks. An attacker who convinces a victim to click a crafted link can silently redirect the browser to an arbitrary external domain, enabling phishing, credential harvesting, and OAuth token theft. Additionally, scheme-relative URLs (//evil.example/) bypass naive https?://-only allow-list filters that developers might add as ad-hoc mitigations.

Dynamic PoC confirmed against waku 1.0.0-beta.0 (commit 8e9f542) in an isolated Docker environment. Two independent dynamic runs produced identical results.


Root Cause

packages/waku/src/router/define-router.tsx:156–161:

export function unstable_redirect(
  location: string, // only URL `pathname` is supported.
  status: 303 | 307 | 308 = 307,
): never {
  throw createCustomError('Redirect', { status, location });
}

The JSDoc comment states "only URL pathname is supported", but this constraint is expressed as documentation only — the function performs no validation. The location value propagates via createCustomError (custom-errors.ts:22–26) into an error digest, is recovered by getErrorInfo in the request handler (handler.ts:79–89), and reflected directly into headers.location of the outgoing Response with no sanitization:

if (info?.location) {
  headers.location = info.location;   // handler.ts:87 — unvalidated reflection
}
return new Response(body, { status, headers });

Trigger (one-line summary)

Any developer-supplied user input passed to unstable_redirect() is reflected unchanged into the HTTP Location header, enabling navigation to an attacker-controlled domain.


Affected Entry Surfaces

  • unstable_redirect(location, status?)waku/router/server public export
  • Any page/route component that passes searchParams, query, or other user- controlled strings to unstable_redirect (the standard post-login or callback redirect pattern)
  • All waku adapters (Node.js, Cloudflare Workers, Vercel Edge, Deno) share the same handler.ts reflection path; cross-runtime CRLF parity is unaudited (see note below)

Additional Defense-in-Depth Concern

On Node.js, CRLF injection via the Location header is rejected by node:_http_outgoing.setHeader (ERR_INVALID_CHAR). This defense is platform-specific and not present in the waku source. Cloudflare Workers, Deno Deploy, and other edge runtimes have not been verified to offer equivalent protection. A cross-runtime audit is recommended.


Suggested Fix Outline

Validate the location argument inside unstable_redirect before the error is thrown: reject any value that does not begin with a single / (no //), and reject any value containing control characters (\x00\x1f). An opt-in allow-list for intentional cross-origin redirects can be provided via a framework configuration option.


Disclosure

Field Value
Reporter j0hndo (dohyun4466@gmail.com)
Discovery date 2026-05-17
Embargo 90 days from acknowledgment
Patched version Not yet available
Public references CWE-601; OWASP A01:2021
Show details on source website

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.0.0-beta.0"
      },
      "package": {
        "ecosystem": "npm",
        "name": "waku"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.0.0-beta.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-49456"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-08T20:30:21Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "## Summary\n\nThe `unstable_redirect()` helper exported from `waku/router/server` (`packages/waku/src/router/define-router.tsx:156\u2013161`) accepts an arbitrary string and reflects it unchanged into the HTTP `Location` response header with no URL validation, scheme restriction, or path-only enforcement. Any application that passes user-controlled input to this helper \u2014 the natural pattern documented in the JSDoc and official fixtures \u2014 is vulnerable to open redirect attacks. An attacker who convinces a victim to click a crafted link can silently redirect the browser to an arbitrary external domain, enabling phishing, credential harvesting, and OAuth token theft. Additionally, scheme-relative URLs (`//evil.example/`) bypass naive `https?://`-only allow-list filters that developers might add as ad-hoc mitigations.\n\nDynamic PoC confirmed against **waku 1.0.0-beta.0** (commit `8e9f542`) in an isolated Docker environment. Two independent dynamic runs produced identical results.\n\n---\n\n## Root Cause\n\n`packages/waku/src/router/define-router.tsx:156\u2013161`:\n\n```ts\nexport function unstable_redirect(\n  location: string, // only URL `pathname` is supported.\n  status: 303 | 307 | 308 = 307,\n): never {\n  throw createCustomError(\u0027Redirect\u0027, { status, location });\n}\n```\n\nThe JSDoc comment states \"only URL `pathname` is supported\", but this constraint is expressed as documentation only \u2014 the function performs **no validation**. The `location` value propagates via `createCustomError` (`custom-errors.ts:22\u201326`) into an error digest, is recovered by `getErrorInfo` in the request handler (`handler.ts:79\u201389`), and reflected directly into `headers.location` of the outgoing `Response` with no sanitization:\n\n```ts\nif (info?.location) {\n  headers.location = info.location;   // handler.ts:87 \u2014 unvalidated reflection\n}\nreturn new Response(body, { status, headers });\n```\n\n---\n\n## Trigger (one-line summary)\n\nAny developer-supplied user input passed to `unstable_redirect()` is reflected unchanged into the HTTP `Location` header, enabling navigation to an attacker-controlled domain.\n\n---\n\n## Affected Entry Surfaces\n\n- `unstable_redirect(location, status?)` \u2014 `waku/router/server` public export\n- Any page/route component that passes `searchParams`, `query`, or other user-\n  controlled strings to `unstable_redirect` (the standard post-login or callback\n  redirect pattern)\n- All waku adapters (Node.js, Cloudflare Workers, Vercel Edge, Deno) share the same\n  `handler.ts` reflection path; cross-runtime CRLF parity is unaudited (see note\n  below)\n\n---\n\n## Additional Defense-in-Depth Concern\n\nOn Node.js, CRLF injection via the `Location` header is rejected by `node:_http_outgoing.setHeader` (`ERR_INVALID_CHAR`). This defense is **platform-specific** and not present in the waku source. Cloudflare Workers, Deno Deploy, and other edge runtimes have not been verified to offer equivalent protection. A cross-runtime audit is recommended.\n\n---\n\n## Suggested Fix Outline\n\nValidate the `location` argument inside `unstable_redirect` before the error is thrown: reject any value that does not begin with a single `/` (no `//`), and reject any value containing control characters (`\\x00`\u2013`\\x1f`). An opt-in allow-list for intentional cross-origin redirects can be provided via a framework configuration option.\n\n---\n\n## Disclosure\n\n| Field            | Value                              |\n|------------------|------------------------------------|\n| Reporter         | j0hndo (`dohyun4466@gmail.com`)    |\n| Discovery date   | 2026-05-17                         |\n| Embargo          | 90 days from acknowledgment        |\n| Patched version  | Not yet available                  |\n| Public references| CWE-601; OWASP A01:2021            |",
  "id": "GHSA-43fc-v873-qw85",
  "modified": "2026-07-08T20:30:21Z",
  "published": "2026-07-08T20:30:21Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/wakujs/waku/security/advisories/GHSA-43fc-v873-qw85"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/wakujs/waku"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wakujs/waku/releases/tag/v1.0.0-beta.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Waku has an Open Redirect via `unstable_redirect` Helper"
}

GHSA-43GX-6GV6-3JCP

Vulnerability from github – Published: 2026-03-02 20:14 – Updated: 2026-06-08 18:34
VLAI
Summary
Products.isurlinportal has possible open redirect when using more than 2 forward slashes
Details

Impact

A url /login?came_from=////evil.example may redirect to an external website after login.

Standard Plone is not affected, but if you have customised the login, for example with add-ons, you might be affected. You can try the url to check if you are affected or not.

Patches

The problem has been patched in Products.isurlinportal.

  • Plone 6.2: upgrade to Products.isurlinportal 4.0.0.
  • Plone 6.1: upgrade to Products.isurlinportal 3.1.0.
  • Plone 6.0: upgrade to Products.isurlinportal 2.1.0.
  • Older Plone versions don't have security support anymore.

Workarounds

There are no known workarounds.

Background

When you are anonymous and land on a page that requires a login, Plone sends you to the login form. After successful login, Plone redirects you back to the page you came from. Various other forms and pages have a similar system.

This could get abused by an attacker to trick Plone into redirecting to a different website. Plone checks the page that would be redirected to. It is only accepted if it is within the Plone site domain or part of a different trusted domain.

The main check for this is in the Products.isurlinportal package. A lot of potentially malicious urls are already safely rejected, but here a loop hole was found.

This was discovered during a penetration test by the CERT-EU Team.

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "Products.isurlinportal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0a1"
            },
            {
              "fixed": "4.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.0.0a1"
      ]
    },
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "Products.isurlinportal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "Products.isurlinportal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "products-isurlinportal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "products-isurlinportal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-28413"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-02T20:14:23Z",
    "nvd_published_at": "2026-03-05T21:16:22Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nA url `/login?came_from=////evil.example` may redirect to an external website after login.\n\nStandard Plone is not affected, but if you have customised the login, for example with add-ons, you might be affected. You can try the url to check if you are affected or not.\n\n### Patches\nThe problem has been patched in `Products.isurlinportal`.\n\n* Plone 6.2: upgrade to `Products.isurlinportal` 4.0.0.\n* Plone 6.1: upgrade to `Products.isurlinportal` 3.1.0.\n* Plone 6.0: upgrade to `Products.isurlinportal` 2.1.0.\n* Older Plone versions don\u0027t have security support anymore.\n\n### Workarounds\nThere are no known workarounds.\n\n### Background\nWhen you are anonymous and land on a page that requires a login, Plone sends you to the login form. After successful login, Plone redirects you back to the page you came from.  Various other forms and pages have a similar system.\n\nThis could get abused by an attacker to trick Plone into redirecting to a different website. Plone checks the page that would be redirected to. It is only accepted if it is within the Plone site domain or part of a different trusted domain.\n\nThe main check for this is in the `Products.isurlinportal` package. A lot of potentially malicious urls are already safely rejected, but here a loop hole was found.\n\nThis was discovered during a penetration test by the CERT-EU Team.",
  "id": "GHSA-43gx-6gv6-3jcp",
  "modified": "2026-06-08T18:34:31Z",
  "published": "2026-03-02T20:14:23Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/plone/Products.isurlinportal/security/advisories/GHSA-43gx-6gv6-3jcp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28413"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/plone/Products.isurlinportal"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/products-isurlinportal/PYSEC-2026-112.yaml"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Products.isurlinportal has possible open redirect when using more than 2 forward slashes"
}

Mitigation MIT-5
Implementation

Strategy: Input Validation

  • Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
  • When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
  • Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
  • Use a list of approved URLs or domains to be used for redirection.
Mitigation
Architecture and Design

Use an intermediate disclaimer page that provides the user with a clear warning that they are leaving the current site. Implement a long timeout before the redirect occurs, or force the user to click on the link. Be careful to avoid XSS problems (CWE-79) when generating the disclaimer page.

Mitigation MIT-21.2
Architecture and Design

Strategy: Enforcement by Conversion

  • When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
  • For example, ID 1 could map to "/login.asp" and ID 2 could map to "http://www.example.com/". Features such as the ESAPI AccessReferenceMap [REF-45] provide this capability.
Mitigation
Architecture and Design

Ensure that no externally-supplied requests are honored by requiring that all redirect requests include a unique nonce generated by the application [REF-483]. Be sure that the nonce is not predictable (CWE-330).

Mitigation MIT-6
Architecture and Design Implementation

Strategy: Attack Surface Reduction

  • Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide data to the application. Remember that such inputs may be obtained indirectly through API calls.
  • Many open redirect problems occur because the programmer assumed that certain inputs could not be modified, such as cookies and hidden form fields.
Mitigation MIT-29
Operation

Strategy: Firewall

Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth [REF-1481].

CAPEC-178: Cross-Site Flashing

An attacker is able to trick the victim into executing a Flash document that passes commands or calls to a Flash player browser plugin, allowing the attacker to exploit native Flash functionality in the client browser. This attack pattern occurs where an attacker can provide a crafted link to a Flash document (SWF file) which, when followed, will cause additional malicious instructions to be executed. The attacker does not need to serve or control the Flash document. The attack takes advantage of the fact that Flash files can reference external URLs. If variables that serve as URLs that the Flash application references can be controlled through parameters, then by creating a link that includes values for those parameters, an attacker can cause arbitrary content to be referenced and possibly executed by the targeted Flash application.