Vulnerability Description
nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. Prior to version 0.3.8, Operator session tokens are stored in plaintext in the operator_sessions table (the token column is the PRIMARY KEY). The session token is a 32-byte random hex value sent directly in a cookie and valid for 24 hours. Anyone who can read the database (backup, snapshot, file copy, or SQL-level disclosure) obtains every active session token and can hijack operator sessions directly, with no further authentication. This issue has been patched in version 0.3.8.
Related Weaknesses (CWE)
References
- https://github.com/forgekeep/nebula-mesh/commit/7cb01bab281ded557f8b6c81dab5f48d
- https://github.com/forgekeep/nebula-mesh/releases/tag/v0.3.8
- https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-q4vm-pq3q-8wgq
FAQ
What is CVE-2026-53603?
CVE-2026-53603 is a documented vulnerability. nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. Prior to version 0.3.8, Operator session tokens are stored in plaintext in the operator_sessions table (the token column is the PR...
How severe is CVE-2026-53603?
CVSS scoring is not yet available for CVE-2026-53603. Check NVD for updates.
Is there a patch for CVE-2026-53603?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.