Vulnerability Description
Prometheus is an open-source monitoring system and time series database. Prior to versions 3.5.3 and 3.11.3, the client_secret field in the Azure AD remote write OAuth configuration (storage/remote/azuread) was typed as string instead of Secret. Prometheus redacts fields of type Secret when serving the configuration via the /-/config HTTP API endpoint. Because the field was a plain string, the Azure OAuth client secret was exposed in plaintext to any user or process with access to that endpoint. This issue has been patched in versions 3.5.3 and 3.11.3.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Prometheus | Prometheus | >= 2.48.0, < 3.5.3 |
Related Weaknesses (CWE)
References
- https://github.com/prometheus/prometheus/pull/18587Issue TrackingPatch
- https://github.com/prometheus/prometheus/pull/18590Issue TrackingPatch
- https://github.com/prometheus/prometheus/releases/tag/v3.11.3Release Notes
- https://github.com/prometheus/prometheus/releases/tag/v3.5.3Release Notes
- https://github.com/prometheus/prometheus/security/advisories/GHSA-wg65-39gg-5wfjVendor Advisory
FAQ
What is CVE-2026-42151?
CVE-2026-42151 is a vulnerability with a CVSS score of 7.5 (HIGH). Prometheus is an open-source monitoring system and time series database. Prior to versions 3.5.3 and 3.11.3, the client_secret field in the Azure AD remote write OAuth configuration (storage/remote/az...
How severe is CVE-2026-42151?
CVE-2026-42151 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-42151?
Check the references section above for vendor advisories and patch information. Affected products include: Prometheus Prometheus.