CVE-2026-42151

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/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 v3.1 Score

7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Published: 5/4/2026Modified: 9/10/2026

Related Intelligence (1)

CRITICALAi

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Rapid7

References (56)

https://github.com/prometheus/prometheus/pull/18587Issue TrackingPatchhttps://github.com/prometheus/prometheus/pull/18590Issue TrackingPatchhttps://github.com/prometheus/prometheus/releases/tag/v3.11.3Release Noteshttps://github.com/prometheus/prometheus/releases/tag/v3.5.3Release Noteshttps://github.com/prometheus/prometheus/security/advisories/GHSA-wg65-39gg-5wfjVendor Advisoryhttps://access.redhat.com/errata/RHSA-2026:25039https://access.redhat.com/errata/RHSA-2026:25245https://access.redhat.com/errata/RHSA-2026:25504https://access.redhat.com/errata/RHSA-2026:34357https://access.redhat.com/errata/RHSA-2026:34359https://access.redhat.com/errata/RHSA-2026:36651https://access.redhat.com/errata/RHSA-2026:36796https://access.redhat.com/errata/RHSA-2026:36797https://access.redhat.com/errata/RHSA-2026:37267https://access.redhat.com/errata/RHSA-2026:37271https://access.redhat.com/errata/RHSA-2026:37272https://access.redhat.com/errata/RHSA-2026:40118https://access.redhat.com/errata/RHSA-2026:40262https://access.redhat.com/errata/RHSA-2026:40768https://access.redhat.com/errata/RHSA-2026:40945https://access.redhat.com/errata/RHSA-2026:40970https://access.redhat.com/errata/RHSA-2026:40972https://access.redhat.com/errata/RHSA-2026:40974https://access.redhat.com/errata/RHSA-2026:41019https://access.redhat.com/errata/RHSA-2026:41030https://access.redhat.com/errata/RHSA-2026:41031https://access.redhat.com/errata/RHSA-2026:41066https://access.redhat.com/errata/RHSA-2026:42146https://access.redhat.com/errata/RHSA-2026:42796https://access.redhat.com/errata/RHSA-2026:42852https://access.redhat.com/errata/RHSA-2026:43052https://access.redhat.com/errata/RHSA-2026:44622https://access.redhat.com/errata/RHSA-2026:47149https://access.redhat.com/errata/RHSA-2026:47952https://access.redhat.com/errata/RHSA-2026:50843https://access.redhat.com/errata/RHSA-2026:50874https://access.redhat.com/errata/RHSA-2026:53412https://access.redhat.com/errata/RHSA-2026:53413https://access.redhat.com/errata/RHSA-2026:53415https://access.redhat.com/errata/RHSA-2026:53530https://access.redhat.com/errata/RHSA-2026:54288https://access.redhat.com/errata/RHSA-2026:54427https://access.redhat.com/errata/RHSA-2026:56340https://access.redhat.com/errata/RHSA-2026:57191https://access.redhat.com/errata/RHSA-2026:60386https://access.redhat.com/errata/RHSA-2026:60387https://access.redhat.com/errata/RHSA-2026:60388https://access.redhat.com/errata/RHSA-2026:60389https://access.redhat.com/errata/RHSA-2026:60390https://access.redhat.com/errata/RHSA-2026:60391https://access.redhat.com/errata/RHSA-2026:60441https://access.redhat.com/errata/RHSA-2026:60477https://access.redhat.com/errata/RHSA-2026:63103https://access.redhat.com/security/cve/CVE-2026-42151https://bugzilla.redhat.com/show_bug.cgi?id=2466507https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42151.json