by Kastro
Paper/Archive/CVE-2026-55181

CVE-2026-55181

Quenary tugtainer — Tugtainer: OIDC login remains accessible when OIDC_ENABLED is false

EPSS 0.6%public exploitCVSS 9.4
critical.is priorityof 100
48
CVSS 9.4 (CNA)9.4 / 10 × 3028.2Not in CISA KEV+300.0EPSS percentile 48.5.485 × 209.7Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
tugtainer< 1.30.3–CNA

Scores by source

GitHub_M (CNA)9.4CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitgithub.com/Quenary/tugtainer/security/advisories/GHSA-rg7c-vpfp-2w43refgithub.com/Quenary/tugtainer/commit/76371db679334b002d4af544b0f3b8587ad86f52refgithub.com/Quenary/tugtainer/releases/tag/v1.30.3