CVE-2026-53603

nebula-mesh: Operator session tokens stored in plaintext in the database

State: Published
Severity: 7.1 High
Published: Sep 4, 2026
Updated: Sep 8, 2026
Reserved: Jun 9, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.1 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-312 Cleartext Storage of Sensitive Information
CWE-522 Insufficiently Protected Credentials

Affected Products

Product	Versions
nebula-meshforgekeep	< 0.3.8Affected

References

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