# CVE-2026-42151: Prometheus Azure AD remote write OAuth client secret exposed via config API

CVE-2026-42151 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-42151, released May 4, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-42151
- Priority: High
- CVSS: 8.2 (Moderate)
- EPSS: 0.0035
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 4, 2026
- Weakness: Exposure of Sensitive Information to an Unauthorized Actor
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42151

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | flightctl RHEL 10 | 1.1.3-1.el10em | [RHSA-2026:41019](https://patchblox.com/security/data/fix/linux/rhsa-2026-41019.md) | May 22, 2026 |
| Linux | govulncheck-vulndb opensuse-leap 16.0 | 0.0.20260723T184607-160000.1.1 | [OPENSUSE-SU-2026:21483-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21483-1.md) | Jul 30, 2026 |
| Linux | opentelemetry-collector RHEL 10 | 0.152.1-1.el10_0 | [RHSA-2026:53413](https://patchblox.com/security/data/fix/linux/rhsa-2026-53413.md) | Jul 2, 2026 |
| Linux | opentelemetry-collector RHEL 9 | 0:0.152.1-1.el9_8 | [RHSA-2026:34359](https://patchblox.com/security/data/fix/linux/rhsa-2026-34359.md) | Jul 2, 2026 |
| Linux | opentelemetry-collector almalinux 10 | 0.152.1-1.el10_2 | [ALSA-2026:34357](https://patchblox.com/security/data/fix/linux/alsa-2026-34357.md) | Jul 1, 2026 |
| Linux | opentelemetry-collector almalinux 9 | 0.152.1-1.el9_8 | [ALSA-2026:34359](https://patchblox.com/security/data/fix/linux/alsa-2026-34359.md) | Jul 1, 2026 |
| Linux | opentelemetry-collector rocky 10 | 0:0.152.1-1.el10_2 | [RLSA-2026:34357](https://patchblox.com/security/data/fix/linux/rlsa-2026-34357.md) | Jul 7, 2026 |
| Linux | opentelemetry-collector rocky 9 | 0:0.152.1-1.el9_8 | [RLSA-2026:34359](https://patchblox.com/security/data/fix/linux/rlsa-2026-34359.md) | Jul 5, 2026 |
| Linux | prometheus Debian 14 | 3.5.3+ds1-1 | [DEBIAN-CVE-2026-42151](https://patchblox.com/security/data/fix/linux/debian-cve-2026-42151.md) | May 4, 2026 |

---

Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.