CVE-2026-53603

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    CVE-2026-53603

    Published: 4 Sept 2026Last Modified: 10 Sept 2026

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

    Details: 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.

    References: https://github.com/forgekeep/nebula-mesh/releases/tag/v0.3.8, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53603.json, https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-q4vm-pq3q-8wgq, https://nvd.nist.gov/vuln/detail/CVE-2026-53603, https://github.com/forgekeep/nebula-mesh/commit/7cb01bab281ded557f8b6c81dab5f48d4c10182e

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -7cb01bab281ded557f8b6c81dab5f48d4c10182e

    Affected versions

    v0.3.7
    v0.3.6
    v0.3.5
    v0.3.4
    v0.3.3
    v0.3.2
    v0.3.1
    v0.3.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-53603 | CVE-DB