CVE-2026-14199 Grafana CVE debrief

Who should care

Grafana instance administrators and users with elevated privileges; verify and adjust Auth Proxy cache settings to prevent potential authentication bypass. Affected operator roles include system administrators, security teams, and platform owners who manage Grafana instances. Vulnerability management and security teams should review and implement compensating controls for exposed systems while remediation is scheduled and verified.

Technical summary

CVE-2026-14199 is an authentication bypass vulnerability in Grafana, affecting self-managed instances with Auth Proxy authentication and identity caching enabled; an authenticated user can shape their attributes to collide with a higher-privileged user's cache entry, allowing authentication as that user. The vulnerability arises from the Auth Proxy cache key concatenating the username and forwarded identity attributes without a delimiter, enabling distinct identities to collide on one key. This issue can lead to an attacker gaining elevated privileges up to Administrator.

Defensive priority

Authenticated users with crafted attributes may bypass authentication, gaining elevated privileges up to Administrator; verify Auth Proxy cache configuration and monitor for suspicious activity.

Recommended defensive actions

• Verify Auth Proxy cache configuration and synchronization settings
• Monitor for suspicious authentication activity
• Restrict access to sensitive Grafana features and data
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE description indicates that only self-managed Grafana instances with Auth Proxy authentication and identity caching enabled are affected; verify instance configuration and cache settings. To further assess the vulnerability, defenders should review the official CVE Program record and NIST NVD detail page for additional information and source-specific vulnerability assessment. Verify Auth Proxy cache configuration and synchronization settings to prevent potential authentication bypass. Monitor for suspicious authentication activity and restrict access to sensitive Grafana features and data.

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.