Vulnerability Description
nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. From version 0.6.0 to before version 0.7.2, non-admin operators (role user) can set allow_private: true on their own managed webhook subscription (POST/PATCH /api/v1/webhook-subscriptions). No admin check exists on this field. At delivery time, allow_private switches the dispatcher to an unguarded HTTP client, bypassing the private/loopback/link-local SSRF guard — letting a low-privilege operator make the server request internal addresses. This issue has been patched in version 0.7.2.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/forgekeep/nebula-mesh/commit/f3c54530e388dd21763e548923426e60
- https://github.com/forgekeep/nebula-mesh/releases/tag/v0.7.2
- https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-7rx3-5wx3-5v76
- https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-7rx3-5wx3-5v76
FAQ
What is CVE-2026-63464?
CVE-2026-63464 is a vulnerability with a CVSS score of 7.7 (HIGH). nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. From version 0.6.0 to before version 0.7.2, non-admin operators (role user) can set allow_private: true on their own managed webho...
How severe is CVE-2026-63464?
CVE-2026-63464 has been rated HIGH with a CVSS base score of 7.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-63464?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.