CVE-2026-119566
Prometheus through 3.15.1 Credential Leak via remote_write Cross-Host Redirects
- State
- Published
- Severity
- 6.3 Medium
- Published
- Oct 30, 2026
- Updated
- Oct 30, 2026
- Reserved
- Oct 30, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 4.8 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-522 Insufficiently Protected Credentials
Affected Products
| Product | Versions |
|---|---|
prometheusprometheus |
|
References
- https://github.com/prometheus/prometheus/blob/v3.15.1/storage/remote/azuread/azuread.go#L326-L333technical-description
- https://github.com/prometheus/prometheus/blob/v3.15.1/storage/remote/client.go#L205-L216technical-description
- https://github.com/prometheus/common/pull/901relatedpatchissue-tracking
- https://abraxaslabs.tech/research/prometheus-bearer-redirectthird-party-advisory
- https://github.com/prometheus/prometheusproduct
- VulnCheck Advisory: Prometheus through 3.15.1 Credential Leak via remote_write Cross-Host Redirectsthird-party-advisory
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