7.5

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

Modified
AliasesRHSA-2026:25504UBUNTU-CVE-2026-42151DEBIAN-CVE-2026-42151
Published 04-05-2026Last modified 10-09-2026

Vulnerability summary

CVE-2026-42151 is a high (CVSS 7.5) vulnerability in prometheus. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 28.9% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.35%
0%100%
Low · -0.06 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 13 · Related 5
OPENSUSE-SU-2026:10676-1OPENSUSE-SU-2026:21483-1RHSA-2026:25039RHSA-2026:25245RHSA-2026:34357RHSA-2026:34359

Timeline

  1. 04-05-2026
    PublishedVulnerability first disclosed.
  2. 10-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

9 scores · 9 sources · 1 version

EPSS trend

Probability

0.35%

Chance of exploitation in the next 30 days

Percentile

29%

Versus all other CVEs

30-day change

Decrease -0.06 pp

From 0.41% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard199 products
  • agentbeat< 9.2.7-r8
  • agentbeat-fips< 9.2.7-r9
  • amazon-cloudwatch-agentAll versions (No fix recorded)
  • amazon-cloudwatch-agent-fipsAll versions (No fix recorded) | < 1.300074.1-r1
  • amazon-cloudwatch-agent-operator< 3.5.0-r5
Alpine1 product
  • prometheus≥ 2.48.0, < 3.5.3-r0

2 vendors · 200 products · Showing 200 of 434

References

66 links
Show all 66 references