Vulnerability in Quenary Tugtainer
CVE-2026-87004
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.
Published .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Quenary Tugtainer — versions < 1.31.3
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-87004?
- CVE-2026-87004 is a high-severity vulnerability in Quenary Tugtainer, classified under Improper Verification of Cryptographic Signature. CVSS score: 8.1/10. Published 2026-09-30.
- How severe is CVE-2026-87004?
- High severity. CVSS v3 base score is 8.1 out of 10.