CVE-2025-71435 Coder CVE debrief

Who should care

Defenders responsible for Coder deployments, security teams, and operators managing Coder environments should assess exposure and prioritize verification of Coder versions to mitigate potential risks associated with this session expiration bypass vulnerability.

Why it matters

CVE-2025-71435 is a session expiration bypass vulnerability in Coder before version 2.23.0 that allows authenticated users to retain access after OIDC token expiry. Defenders responsible for Coder deployments should assess exposure and prioritize verification of Coder versions.

• Authenticated users can retain access after OIDC token expiry
• APIKey cookie can be kept active through regular use
• Access can be extended indefinitely after losing OIDC authorization

Technical summary

The vulnerability allows authenticated users to retain access after OIDC token expiry when no refresh token is issued. Users can keep their APIKey cookie active through regular use, extending it every 24 hours to access Coder indefinitely after losing OIDC authorization. This session expiration bypass vulnerability in Coder before version 2.23.0 could lead to prolonged unauthorized access if not addressed. Defenders should prioritize verifying Coder versions and assessing exposure to mitigate potential risks associated with this vulnerability.

Defensive priority

Defenders should prioritize verifying Coder versions and assessing exposure, as this vulnerability allows authenticated users to retain access after OIDC token expiry.

Recommended defensive actions

• Verify Coder version and assess exposure
• Evaluate authentication and authorization configurations
• Consider upgrading to version 2.23.0 or later
• Review compensating controls for exposed systems
• Check relevant monitoring, detection, and logs for exposed assets
• Track exceptions and retest remediated assets
• Plan vendor-supported updates through normal change control

Evidence notes

The CVE record and NVD entry provide details on the session expiration bypass vulnerability in Coder before version 2.23.0. The vulnerability allows authenticated users to retain access after OIDC token expiry when no refresh token is issued. Evidence is based on official CVE and NVD sources, with limitations in public detail. Defenders should verify Coder versions and assess exposure based on available information.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.