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Vulnerability record · CVE-2026-55181 · published 30 September 2026

CVE-2026-55181: Improper access control vulnerability

Tugtainer is a self-hosted app for automating updates of Docker containers. Prior to version 1.30.3, Tugtainer's OIDC authentication can still be initiated even when OIDC_ENABLED=false. The /auth/oidc/enabled endpoint correctly reports that OIDC is disabled. However, a direct request to /auth/oidc/login still starts the OIDC login flow, returns HTTP 302, sets an oidc_state cookie, and redirects the user to the configured OIDC authorization endpoint. This bypasses the intended OIDC disable switch. This issue has been patched in version 1.30.3.

9.4 CVSS 3.1 Critical CWE-284 · Improper access control Deferred
9.4CVSS 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 1.30.3, Tugtainer's OIDC authentication can still be initiated even when OIDC_ENABLED=false. The /auth/oidc/enabled endpoint correctly reports that OIDC is disabled. However, a direct request to /auth/oidc/login still starts the OIDC login flow, returns HTTP 302, sets an oidc_state cookie, and redirects the user to the configured OIDC authorization endpoint. This bypasses the intended OIDC disable switch. This issue has been patched in version 1.30.3.

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

References

LinkTags
https://github.com/Quenary/tugtainer/commit/76371db679334b002d4af544b0f3b8587ad86f52
https://github.com/Quenary/tugtainer/releases/tag/v1.30.3
https://github.com/Quenary/tugtainer/security/advisories/GHSA-rg7c-vpfp-2w43
https://github.com/Quenary/tugtainer/security/advisories/GHSA-rg7c-vpfp-2w43

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Source: NIST National Vulnerability Database (record CVE-2026-55181), CISA KEV, FIRST EPSS. This page is refreshed as NVD updates the record.