Critical severity · published Sep 30, 2026
CVE-2026-55181
Tugtainer: OIDC login remains accessible when OIDC_ENABLED is false
9.4
CVSS
0.6%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TU
tugtainer · Quenary
< 1.30.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55181
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55181
x_refsource_CONFIRM
https://github.com/Quenary/tugtainer/security/advisories/GHSA-rg7c-vpfp-2w43
x_refsource_MISC
https://github.com/Quenary/tugtainer/commit/76371db679334b002d4af544b0f3b8587ad86f52
x_refsource_MISC
https://github.com/Quenary/tugtainer/releases/tag/v1.30.3
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