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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-42151

36
FAUCET Score

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.

First published: May 4, 2026Last modified: May 4, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.48.0, < 3.5.3CPE matchmatch criteria
cpe:2.3:a:prometheus:prometheus:*:*:*:*:*:*:*:*
>= 3.6.0, < 3.11.3CPE matchmatch criteria
cpe:2.3:a:prometheus:prometheus:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.35%
Probability of exploitation in next 30 days
EPSS Percentile
27.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0035 is in the 7th percentile among its peer group of 51,466 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/prometheus/prometheusFixed in: 0.311.3
microsoftpatch availablevia msrc
Product: 21395-17084Fixed in: 1.31.0-22
microsoftpatch availablevia msrc
Product: azl3 telegraf 1.31.0-22 on Azure Linux 3.0Fixed in: 1.31.0-22

Vendor Advisories (2)

goGHSA-wg65-39gg-5wfjhigh

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

May 5, 2026
microsoft2026-May/CVE-2026-42151Important

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

May 2, 2026

References

access.redhat.com / errata/RHSA-2026:25039
access.redhat.com / errata/RHSA-2026:25245
access.redhat.com / errata/RHSA-2026:25504
access.redhat.com / errata/RHSA-2026:34357
access.redhat.com / errata/RHSA-2026:34359
access.redhat.com / errata/RHSA-2026:36651
access.redhat.com / errata/RHSA-2026:36796
access.redhat.com / errata/RHSA-2026:36797
access.redhat.com / errata/RHSA-2026:37267
access.redhat.com / errata/RHSA-2026:37271
access.redhat.com / errata/RHSA-2026:37272
access.redhat.com / errata/RHSA-2026:40118
access.redhat.com / errata/RHSA-2026:40262
access.redhat.com / errata/RHSA-2026:40768
access.redhat.com / errata/RHSA-2026:40945
access.redhat.com / errata/RHSA-2026:40970
access.redhat.com / errata/RHSA-2026:40972
access.redhat.com / errata/RHSA-2026:40974
access.redhat.com / errata/RHSA-2026:41019
access.redhat.com / errata/RHSA-2026:41030
access.redhat.com / errata/RHSA-2026:41031
access.redhat.com / errata/RHSA-2026:41066
access.redhat.com / errata/RHSA-2026:42146
access.redhat.com / errata/RHSA-2026:42796
access.redhat.com / errata/RHSA-2026:42852
access.redhat.com / errata/RHSA-2026:43052
access.redhat.com / security/cve/CVE-2026-42151
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-42151.json
github.com / prometheus/prometheus/pull/18587
Issue TrackingPatch
github.com / prometheus/prometheus/pull/18590
Issue TrackingPatch
github.com / prometheus/prometheus/releases/tag/v3.11.3
Release Notes
github.com / prometheus/prometheus/releases/tag/v3.5.3
Release Notes
github.com / prometheus/prometheus/security/advisories/GHSA-wg65-39gg-5wfj
Vendor Advisory