CVE-2026-42151

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.

PUBLISHED Reserved 2026-04-24 | Published 2026-05-04 | Updated 2026-05-04 | Assigner GitHub_M

Problem types

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

CWE-312: Cleartext Storage of Sensitive Information

Product status

References

github.com/...etheus/security/advisories/GHSA-wg65-39gg-5wfj

github.com/prometheus/prometheus/pull/18587

github.com/prometheus/prometheus/pull/18590

github.com/prometheus/prometheus/releases/tag/v3.11.3

github.com/prometheus/prometheus/releases/tag/v3.5.3

cve.org (CVE-2026-42151)

nvd.nist.gov (CVE-2026-42151)

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