CVE-2026-119566
Prometheus through 3.15.1 Credential Leak via remote_write Cross-Host Redirects
CVSS Score
4.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-522 |
| Vendor | prometheus |
| Product | prometheus |
| Ecosystems | |
| Industries | Technology |
| Published | Oct 30, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
prometheus / prometheus
0 ≤ 3.15.1
References
github.com: https://github.com/prometheus/prometheus/blob/v3.15.1/storage/remote/azuread/azuread.go#L326-L333 github.com: https://github.com/prometheus/prometheus/blob/v3.15.1/storage/remote/client.go#L205-L216 github.com: https://github.com/prometheus/common/pull/901 abraxaslabs.tech: https://abraxaslabs.tech/research/prometheus-bearer-redirect github.com: https://github.com/prometheus/prometheus vulncheck.com: https://www.vulncheck.com/advisories/prometheus-through-3.15.1-credential-leak-via-remote-write-cross-host-redirects
Credits
Abraxas Labs