Vulnerability-Lookup

CVE-2026-47725 (GCVE-0-2026-47725)

Vulnerability from cvelistv5 – Published: 2026-07-28 17:56 – Updated: 2026-07-28 19:36

Title

nebula-mesh: Web UI lacks CSRF tokens on /ui/* mutating endpoints

Summary

nebula-mesh is a self-hosted control plane for Slack Nebula mesh virtual private network. Prior to version 0.3.3, every /ui/* POST / PUT / PATCH / DELETE route processes the request as soon as the session cookie validates. SameSite=Lax on the session cookie prevents most cross-site form submits but does not protect: top-level form-submit navigations from third-party pages (some browsers still send Lax cookies on top-level POSTs); same-registrable-domain attackers (sibling-subdomain XSS, subdomain takeover); the GET /ui/logout route, which a third-party <img src=".../ui/logout"> can force-trigger. This issue has been patched in version 0.3.3.

Severity

6.9 (Medium)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-352 - Cross-Site Request Forgery (CSRF)

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/forgekeep/nebula-mesh/security…	x_refsource_CONFIRM
https://github.com/forgekeep/nebula-mesh/releases…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
juev	nebula-mesh	Affected: < 0.3.3

Show details on NVD website

JSON

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GHSA-273Q-QGH5-WRJ6

Vulnerability from github – Published: 2026-06-08 23:09 – Updated: 2026-06-08 23:09

Summary

nebula-mesh's web UI lacks CSRF tokens on /ui/* mutating endpoints

Details

Every /ui/* POST / PUT / PATCH / DELETE route processes the request as soon as the session cookie validates. SameSite=Lax on the session cookie prevents most cross-site form submits but does not protect:

top-level form-submit navigations from third-party pages (some browsers still send Lax cookies on top-level POSTs)
same-registrable-domain attackers (sibling-subdomain XSS, subdomain takeover)
the GET /ui/logout route, which a third-party <img src=".../ui/logout"> can force-trigger

The admin UI signs CA certificates, mints API keys, rotates / retires / deletes CAs, disables operators, and changes server settings. CSRF here is a real privilege escalation, not just annoyance.

Affected

All released versions up to v0.3.2.

Suggested fix

Double-submit cookie: a 32-byte crypto/rand token in a non-HttpOnly _csrf cookie, echoed in either X-CSRF-Token (htmx) or a _csrf form field (HTML forms). Compared in constant time. Rotated on every privilege transition (Login, OIDC StartAuthenticatedSession, CompleteTwoFactor, Logout) so pre-auth fixation cannot survive promotion. Rejections audit-logged as ui.csrf.rejected with reason; response body stays opaque.

/ui/logout becomes POST so it is no longer reachable via <img> tags.

Fix coordinates with the Secure-cookie advisory disclosed concurrently — the _csrf cookie inherits the same Secure-attribute derivation.

Reproducer

With an authenticated operator session in browser tab A, open the following minimal HTML in any other tab:

<form action="https://nebula.example.com/ui/cas/{ca-id}/delete" method="POST">
  <button>Click for free puppy</button>
</form>

Click. The CA is deleted — the server processes the POST because the session cookie is automatically attached and there is no other check. The same trick works for force-rotate, retire, mint API keys, disable operators, etc.

Alternative force-logout: <img src="https://nebula.example.com/ui/logout"> placed on an attacker's page logs out any visiting authenticated operator. No interaction required.

Notes

Multipart and JSON endpoints don't exist in the current UI surface. Future additions must rely on the header path because r.PostFormValue only reads application/x-www-form-urlencoded bodies. The middleware's package comment documents this.
The patch assumes nebula-mgmt is the sole authority on its registrable domain. A compromised sibling subdomain can still set parent-domain cookies and forge matches; SameSite=Lax does not prevent that. Documented in the patch.

Severity

7.0 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.3.2"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/juev/nebula-mesh"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.3.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-47725"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-269",
      "CWE-352"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-08T23:09:21Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "Every `/ui/*` POST / PUT / PATCH / DELETE route processes the request as soon as the session cookie validates. `SameSite=Lax` on the session cookie prevents most cross-site form submits but does not protect:\n\n- top-level form-submit navigations from third-party pages (some browsers still send Lax cookies on top-level POSTs)\n- same-registrable-domain attackers (sibling-subdomain XSS, subdomain takeover)\n- the `GET /ui/logout` route, which a third-party `\u003cimg src=\".../ui/logout\"\u003e` can force-trigger\n\nThe admin UI signs CA certificates, mints API keys, rotates / retires / deletes CAs, disables operators, and changes server settings. CSRF here is a real privilege escalation, not just annoyance.\n\n## Affected\nAll released versions up to v0.3.2.\n\n## Suggested fix\nDouble-submit cookie: a 32-byte `crypto/rand` token in a non-HttpOnly `_csrf` cookie, echoed in either `X-CSRF-Token` (htmx) or a `_csrf` form field (HTML forms). Compared in constant time. Rotated on every privilege transition (`Login`, OIDC `StartAuthenticatedSession`, `CompleteTwoFactor`, `Logout`) so pre-auth fixation cannot survive promotion. Rejections audit-logged as `ui.csrf.rejected` with reason; response body stays opaque.\n\n`/ui/logout` becomes POST so it is no longer reachable via `\u003cimg\u003e` tags.\n\nFix coordinates with the Secure-cookie advisory disclosed concurrently \u2014 the `_csrf` cookie inherits the same `Secure`-attribute derivation.\n\n## Reproducer\nWith an authenticated operator session in browser tab A, open the following minimal HTML in any other tab:\n\n```html\n\u003cform action=\"https://nebula.example.com/ui/cas/{ca-id}/delete\" method=\"POST\"\u003e\n  \u003cbutton\u003eClick for free puppy\u003c/button\u003e\n\u003c/form\u003e\n```\n\nClick. The CA is deleted \u2014 the server processes the POST because the session cookie is automatically attached and there is no other check. The same trick works for force-rotate, retire, mint API keys, disable operators, etc.\n\nAlternative force-logout: `\u003cimg src=\"https://nebula.example.com/ui/logout\"\u003e` placed on an attacker\u0027s page logs out any visiting authenticated operator. No interaction required.\n\n## Notes\n- Multipart and JSON endpoints don\u0027t exist in the current UI surface. Future additions must rely on the header path because `r.PostFormValue` only reads `application/x-www-form-urlencoded` bodies. The middleware\u0027s package comment documents this.\n- The patch assumes nebula-mgmt is the sole authority on its registrable domain. A compromised sibling subdomain can still set parent-domain cookies and forge matches; SameSite=Lax does not prevent that. Documented in the patch.",
  "id": "GHSA-273q-qgh5-wrj6",
  "modified": "2026-06-08T23:09:21Z",
  "published": "2026-06-08T23:09:21Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/juev/nebula-mesh/security/advisories/GHSA-273q-qgh5-wrj6"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/juev/nebula-mesh"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "nebula-mesh\u0027s web UI lacks CSRF tokens on /ui/* mutating endpoints"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

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