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Vulnerabilities CVE-2026-42151

CVE-2026-42151

High
Open
TLP:CLEAR

Prometheus Azure AD remote write OAuth client secret exposed via config API

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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.

Details

CVSS Score
7.5
EPSS Score
0.35%

28.1th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Confidence
90%
Published
May 4, 2026
Last Modified
Aug 13, 2026
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