CVE-2026-42151

· HIGHModified

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CVSS v3.1

7.5

EPSS

0.35%

Published

May 4, 2026

Modified

Aug 5, 2026

Public PoC / Exploit

All weaponized →

No public PoC or exploit code indexed for this CVE.

Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.

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 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weaknesses (CWE)

CWE-200CWE-312CWE-256

Affected Products (2)

prometheus · prometheus (up to 3.5.3)vulnerable

prometheus · prometheus (up to 3.11.3)vulnerable

References (20)

https://github.com/prometheus/prometheus/pull/18587

Issue TrackingPatch

https://github.com/prometheus/prometheus/pull/18590

Issue TrackingPatch