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CVE-2026-42151

7.5 · HIGH

Prometheus is an open-source monitoring system and time series database.

Published May 4, 2026CWE-200EPSS 0.35%

Overview

CVE-2026-42151 is a high-severity vulnerability. It was published on May 4, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/prometheus/prometheus/pull/18587GitHubgithub.com/prometheus/prometheus/pull/18590GitHubgithub.com/prometheus/prometheus/releases/tag/v3.11.3GitHubgithub.com/prometheus/prometheus/releases/tag/v3.5.3GitHubgithub.com/prometheus/prometheus/security/advisories/GHSA-wg65-39gg-5wfjRefaccess.redhat.com/errata/RHSA-2026:25039Refaccess.redhat.com/errata/RHSA-2026:25245Refaccess.redhat.com/errata/RHSA-2026:25504Refaccess.redhat.com/errata/RHSA-2026:34357Refaccess.redhat.com/errata/RHSA-2026:34359

How CyberStrike helps

Frequently asked questions

What is CVE-2026-42151?

CVE-2026-42151 is a high-severity vulnerability. It was published on May 4, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-42151?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-42151?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-42151?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-42151 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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