CVE-2026-55181 Tugtainer: OIDC login remains accessible when OIDC_ENABLED is false
Attackers can initiate OIDC login flows in Tugtainer even when OIDC is disabled, bypassing the intended security configuration.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-55181?
CVE-2026-55181 is a critical vulnerability in Quenary tugtainer, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-284
Which versions are affected by CVE-2026-55181?
How do I fix CVE-2026-55181?
No fix has been published for CVE-2026-55181 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-55181 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55181 exists.
Sources
Also known as GHSA-rg7c-vpfp-2w43.