CVE-2026-14199 Grafana CVE debrief

Who should care

Defenders and administrators of self-managed Grafana instances, especially those using Auth Proxy authentication and identity caching, should assess exposure and prioritize patching.

Why it matters

CVE-2026-14199 is a high-severity vulnerability affecting self-managed Grafana instances with Auth Proxy authentication and identity caching enabled. Defenders should prioritize verifying and patching affected instances to prevent authentication bypass and potential privilege escalation.

• Authentication bypass by spoofing
• Potential elevation of privileges to Administrator
• Increased risk of unauthorized access to sensitive data and systems

Technical summary

The vulnerability affects self-managed Grafana instances with Auth Proxy authentication and identity caching enabled. The issue arises from the Auth Proxy cache key concatenating username and forwarded identity attributes without a delimiter, allowing distinct identities to collide on one key. An authenticated user can exploit this by shaping their attributes to collide with a higher-privileged user's cache entry, enabling authentication as that user, potentially up to Administrator privileges.

Defensive priority

Defenders should prioritize verifying and patching affected Grafana instances, especially those with Auth Proxy authentication and identity caching enabled.

Recommended defensive actions

• Verify and patch affected Grafana instances
• Review and adjust Auth Proxy authentication and identity caching configurations
• Monitor for suspicious authentication activity
• Perform thorough vulnerability assessments
• Implement compensating controls for exposed systems
• Track exceptions and retest remediated assets
• Review relevant monitoring, detection, and logs for exposed assets

Evidence notes

The vulnerability is confirmed to affect self-managed Grafana instances with specific configurations. The Auth Proxy cache key issue allows for authentication bypass by spoofing. Evidence is based on official CVE Program records and NIST NVD vulnerability assessments. Defenders should verify affected instances, review Auth Proxy configurations, and monitor for suspicious authentication activity.

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.