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Vulnerability record · CVE-2026-55494 · published 30 September 2026

CVE-2026-55494: Improper access control vulnerability

Tugtainer is a self-hosted app for automating updates of Docker containers. Prior to version 1.30.4, Tugtainer Agent allows unauthenticated access to Docker management APIs when AGENT_SECRET is not configured. The Agent uses request signatures to protect its API routes. However, in agent/auth.py, the signature verification function returns successfully if Config.AGENT_SECRET is empty. This causes protected Agent APIs to become accessible without authentication. This issue has been patched in version 1.30.4.

9.8 CVSS 3.1 Critical CWE-284 · Improper access control Deferred
9.8CVSS 3.1 base score
-EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
30 Sep 2026Last modified by NVD

Description

Tugtainer is a self-hosted app for automating updates of Docker containers. Prior to version 1.30.4, Tugtainer Agent allows unauthenticated access to Docker management APIs when AGENT_SECRET is not configured. The Agent uses request signatures to protect its API routes. However, in agent/auth.py, the signature verification function returns successfully if Config.AGENT_SECRET is empty. This causes protected Agent APIs to become accessible without authentication. This issue has been patched in version 1.30.4.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://github.com/Quenary/tugtainer/commit/0052a5544e187a4d12f771838a8a23ca4afb61cd
https://github.com/Quenary/tugtainer/releases/tag/v1.30.4
https://github.com/Quenary/tugtainer/security/advisories/GHSA-wgw2-c96g-p7h7
https://github.com/Quenary/tugtainer/security/advisories/GHSA-wgw2-c96g-p7h7

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Source: NIST National Vulnerability Database (record CVE-2026-55494), CISA KEV, FIRST EPSS. This page is refreshed as NVD updates the record.