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

Quick assessment

Affected
prometheus prometheus
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Prometheus是Prometheus开源的一款使用Go语言编写的、用于记录使用HTTP拉模型构建的时间序列数据库中实时指标的开源软件。 Prometheus 3.5.3之前版本和3.11.3之前版本存在信息泄露漏洞，该漏洞源于Azure AD远程写入OAuth配置中client_secret字段类型为字符串而非Secret，可能导致Azure OAuth客户端密钥以明文形式暴露。

CVSS 7.5 · High EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 2

VendorProduct Version RangeStatus
prometheus prometheus < 3.5.3 affected
>= 3.6.0, < 3.11.3 affected
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I. Basic Information for CVE-2026-42151

Vulnerability Information
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Vulnerability Title
Prometheus Azure AD remote write OAuth client secret exposed via config API
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Prometheus 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Prometheus是Prometheus开源的一款使用Go语言编写的、用于记录使用HTTP拉模型构建的时间序列数据库中实时指标的开源软件。 Prometheus 3.5.3之前版本和3.11.3之前版本存在信息泄露漏洞，该漏洞源于Azure AD远程写入OAuth配置中client_secret字段类型为字符串而非Secret，可能导致Azure OAuth客户端密钥以明文形式暴露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
prometheus prometheus < 3.5.3 -

II. Public POCs for CVE-2026-42151

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III. Intelligence Information for CVE-2026-42151

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Patches & Fixes for CVE-2026-42151 (2)

Vendor Advisories for CVE-2026-42151 (1)

Vendor Pages for CVE-2026-42151 (2)

IV. Related Vulnerabilities

Same product: prometheus
Same vendor: prometheus
Same weakness: CWE-200

V. Comments for CVE-2026-42151

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