Vulnerability-Lookup

GHSA-WFGR-G7H2-C6M6

Vulnerability from github – Published: 2026-06-24 15:31 – Updated: 2026-06-24 15:31

Details

Open redirect vulnerability (CWE-601) in the _safe_redirect function of the click-tracking endpoint (/c//) in Mailerup <1.0.0 on all platforms allows remote unauthenticated attackers to redirect victims to arbitrary external sites and conduct phishing attacks via a crafted u query parameter, because the URL scheme is validated (blocking javascript: and data:) but the destination host is not restricted to an allowlist, and a signing.BadSignature exception is silently caught so a valid signed token is not required.

Severity

5.3 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-13163"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T13:16:31Z",
    "severity": "MODERATE"
  },
  "details": "Open redirect vulnerability (CWE-601) in the _safe_redirect function of the click-tracking endpoint (/c/\u003ctoken\u003e/) in Mailerup \u003c1.0.0\u00a0on all platforms allows remote unauthenticated attackers to redirect victims to arbitrary external sites and conduct phishing attacks via a crafted u\u00a0query parameter, because the URL scheme is validated (blocking javascript: and data:) but the destination host is not restricted to an allowlist, and a signing.BadSignature exception is silently caught so a valid signed token is not required.",
  "id": "GHSA-wfgr-g7h2-c6m6",
  "modified": "2026-06-24T15:31:45Z",
  "published": "2026-06-24T15:31:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-13163"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Maalfer/mailerup/commit/99eb6d4586134bf3f4422093fbf47d6794ef0ee5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-13163 (GCVE-0-2026-13163)

Vulnerability from cvelistv5 – Published: 2026-06-24 12:49 – Updated: 2026-06-24 13:07

Title

Lack of input validation in Mailerup input parameter leads to Open Redirect

Summary

Open redirect vulnerability (CWE-601) in the _safe_redirect function of the click-tracking endpoint (/c/<token>/) in Mailerup <1.0.0 on all platforms allows remote unauthenticated attackers to redirect victims to arbitrary external sites and conduct phishing attacks via a crafted u query parameter, because the URL scheme is validated (blocking javascript: and data:) but the destination host is not restricted to an allowlist, and a signing.BadSignature exception is silently caught so a valid signed token is not required.

Severity

5.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-601 - URL redirection to untrusted site ('open redirect')

Assigner

Secur0

References

1 reference

URL	Tags
https://github.com/Maalfer/mailerup/commit/99eb6d…	patch

Impacted products

1 product

Vendor	Product	Version
Mailerup	Mailerup	Affected: 0 , < 1.0.1 (custom)

Date Public

2026-06-24 12:40

Credits

Dario Rivas Quero from Secur0 security team Cristian Fernandez Cornejo from Secur0 security team Mario Alvarez Fernandez Xoan M. Otero Jorge Secur0 CNA

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-WFGR-G7H2-C6M6

CVE-2026-13163 (GCVE-0-2026-13163)

Tags

Sightings

Nomenclature