CVE-2026-53603
High
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.
SeverityHigh
CVSS7.1
Exploit probability29. percentile0.4%
ProductGithub.com/forgekeep/nebula-mesh
PublishedSep 4, 2026
First seenSep 4, 2026
Weakness typeCWE-312CWE-312CWE-522CWE-522
How to fix
Update
- github.com/forgekeep/nebula-mesh0.3.8 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/forgekeep/nebula-meshGo | v < 0.3.8 | 0.3.8 |
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