MEDIUM 6.3 NVD
CVE-2026-119566
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_w
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.
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/azuread.go#L3
- https://github.com/prometheus/prometheus/blob/v3.15.1/storage/remote/client.go#L205-L216
This medium severity vulnerability with a CVSS score of 6.3 was published on 2026-10-30 via NVD.
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