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.
Metrics
CVSS 3.1 4.8/10
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:NWeakness enumeration
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| prometheus | prometheus | <= 3.15.1 |
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#L326-L333
- https://github.com/prometheus/prometheus/blob/v3.15.1/storage/remote/client.go#L205-L216
- https://www.vulncheck.com/advisories/prometheus-through-3.15.1-credential-leak-via-remote-write-cross-host-redirects
Timeline
- Published
- Oct 30, 2026
- Last modified
- Nov 4, 2026
- NVD status
- Awaiting Analysis