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TI-2026-59429 Aliases CVE-2026-87004

Tugtainer: OIDC id_token claims accepted without signature/audience/expiry verification

Priority HIGH 70CWE-347Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-347.

Summary

Tugtainer is a self-hosted app for automating updates of Docker containers. Prior to version 1.31.3, when the OIDC login flow completes, backend/modules/auth/providers/auth_oidc_provider.py decodes the id_token returned by the identity provider's token endpoint using jose.jwt.get_unverified_claims() instead of jwt.decode(). This skips signature verification, audience (aud) validation, issuer (iss) validation, and expiry (exp) checking entirely. The extracted claims (email/sub/preferred_username) are then used directly as the user_id for the resulting Tugtainer session. This issue has been patched in version 1.31.3.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00338 27th percentileScored 2026-11-07
Fix Fixed tugtainer (Quenary): 1.31.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
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 1.31.31.31.3Patch availableCNA
  • tugtainer VendorQuenary Affected before 1.31.3 Fixed in 1.31.3 Patch available CNA

Remediation

  • Fix · CNA tugtainer (Quenary) Fixed in 1.31.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-87004

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-2026-39865 Tugtainer: OIDC login remains accessible when OIDC_ENABLED is false CVSS 3.1CRITICAL 9.4
  • 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-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