Vulnerability Description
Prometheus through 3.15.1 contains a credential leak vulnerability that allows attackers to capture Azure AD or Google IAM bearer tokens by redirecting remote_write requests to another host. Attackers controlling the remote-write endpoint or a redirecting server can return a 3xx to their host and replay the token, for example to write metrics to the victim's backend.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://abraxaslabs.tech/research/prometheus-bearer-redirect
- https://github.com/prometheus/common/pull/901
- https://github.com/prometheus/prometheus
- https://github.com/prometheus/prometheus/blob/v3.15.1/storage/remote/azuread/azu
- https://github.com/prometheus/prometheus/blob/v3.15.1/storage/remote/client.go#L
- https://www.vulncheck.com/advisories/prometheus-through-3.15.1-credential-leak-v
FAQ
What is CVE-2026-119566?
CVE-2026-119566 is a vulnerability with a CVSS score of 4.8 (MEDIUM). Prometheus through 3.15.1 contains a credential leak vulnerability that allows attackers to capture Azure AD or Google IAM bearer tokens by redirecting remote_write requests to another host. Attackers...
How severe is CVE-2026-119566?
CVE-2026-119566 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-119566?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.