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TI-2026-39865 Aliases CVE-2026-55181

Tugtainer: OIDC login remains accessible when OIDC_ENABLED is false

Priority HIGH 82CWE-284Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-284.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00598 48th percentileScored 2026-11-07
Fix Fixed tugtainer (Quenary): 1.30.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Quenarytugtainerbefore 1.30.31.30.3Patch availableCNA
  • tugtainer VendorQuenary Affected before 1.30.3 Fixed in 1.30.3 Patch available CNA

Remediation

  • Fix · CNA tugtainer (Quenary) Fixed in 1.30.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55181

References

Other 3

  • TI-2026-40047 Tugtainer: Unauthenticated access to Tugtainer Agent Docker management APIs when AGENT_SECRET is unset CVSS 3.1CRITICAL 9.8
  • TI-2026-35252 Tugtainer has Server-Side Template Injection in notification templates that leads to Remote Code Execution CVSS 3.1CRITICAL 9.9
  • TI-2026-44487 Tugtainer: Authenticated SSRF via arbitrary notification URLs in test_notification endpoint CVSS 3.1CRITICAL 9.1
  • TI-2026-19209 Tugtainer vulnerable to Password Exposure via URL Query Parameter CVSS 3.1CRITICAL 9.1
  • TI-2026-59429 Tugtainer: OIDC id_token claims accepted without signature/audience/expiry verification CVSS 3.1HIGH 8.1
  • TI-2025-42655 Tugtainer has RCE in Agent Command Execution Api CVSS 4.0HIGH 8.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences