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

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Summary

CVECVE-2026-42151
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-04 19:16:04 UTC
Updated2026-05-04 19:16:04 UTC
DescriptionPrometheus 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.000100000 probability, percentile 0.012560000 (date 2026-05-05)

Problem Types: CWE-200 | CWE-312 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor | CWE-312 CWE-312: Cleartext Storage of Sensitive Information

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Prometheus Prometheus affected < 3.5.3 Not specified
CNA Prometheus Prometheus affected >= 3.6.0, < 3.11.3 Not specified

References

ReferenceSourceLinkTags
github.com/prometheus/prometheus/pull/18587 [email protected] github.com
github.com/prometheus/prometheus/releases/tag/v3.5.3 [email protected] github.com
github.com/prometheus/prometheus/pull/18590 [email protected] github.com
github.com/prometheus/prometheus/security/advisories/GHSA-wg65-39gg-5wfj [email protected] github.com
github.com/prometheus/prometheus/releases/tag/v3.11.3 [email protected] github.com
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