CVE-2026-87004 Details
Description
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.
A vulnerability in Tugtainer, a self-hosted application for automating Docker container updates, allows for improper validation of OpenID Connect (OIDC) ID tokens. In versions prior to 1.31.3, the OIDC login flow decoded the ID token using an unverified method, bypassing essential security checks such as signature verification, audience validation, issuer validation, and expiry checks. This flaw enables an attacker to impersonate any user by manipulating the ID token claims, which are directly used to create a user session in Tugtainer.
Users can update to Tugtainer version 1.31.3 or later, where this vulnerability has been patched. The update ensures that OIDC ID tokens are verified before being accepted, adding the necessary validation checks.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 30, 2026CISA-ADP
Assessed Sep 30, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/Quenary/tugtainer/security/advisories/GHSA-crjc-6vc7-xrfh | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/Quenary/tugtainer/commit/b55269b6a3bfd43b0f2f5bd5f137ee0c81b7c2e4 | [email protected] | Source CodeVendor |
| https://github.com/Quenary/tugtainer/releases/tag/v1.31.3 | [email protected] | Release NotesVendor |
| https://github.com/Quenary/tugtainer/security/advisories/GHSA-crjc-6vc7-xrfh | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-347 | Improper Verification of Cryptographic Signature | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Quenary Tugtainer | <= 1.31.2 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 30, 2026 | New CVE Received | [email protected] |
| Sep 30, 2026 | CVE Modified | CISA-ADP |