Vulnerability · Published Sep 30, 2026 · Assigned by GitHub_M

CVE-2026-55181Tugtainer: OIDC login remains accessible when OIDC_ENABLED is false

Critical 9.4

In plain English

A critical-severity improper access control in tugtainer from Quenary. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities).

Severity (CVSS 3.1)9.4Critical

Exploit odds (30 days)0.6%top 51.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Quenary	tugtainer	< 1.30.3

Weakness: CWE-284 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

References

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