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

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-42151
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 23:27 UTC · Revision 1

Source evidence

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

core-osv · Original source

Published 4 May 2026, 18:12 UTC

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.

osv:CVE-2026-42151
Complete source record
{
  "id": "bc36ba0af73264e43c68468531c9887da8642a3deea4f72fb759c964302be9fc",
  "url": "https://osv.dev/vulnerability/CVE-2026-42151",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Prometheus Azure AD remote write OAuth client secret exposed via config API",
    "summary": "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.",
    "evidence": "osv:CVE-2026-42151",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-42151",
      "aliases": [
        "BIT-prometheus-2026-42151",
        "CVE-2026-42151",
        "GHSA-wg65-39gg-5wfj",
        "GO-2026-5710"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/prometheus/prometheus",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6d80b30990bc297d95b5c844e118c4011fad8054"
                },
                {
                  "fixed": "dcd3d551ced8b8dc14e0217f8cb14e547109cd5f"
                },
                {
                  "introduced": "491734606591ef8c188f5489c70380805bc868c0"
                },
                {
                  "fixed": "eb173f5256d4022afba1e9bc3d19740a76859fae"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:prometheus:prometheus:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.48.0"
                      },
                      {
                        "fixed": "3.5.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:prometheus:prometheus:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.6.0"
                      },
                      {
                        "fixed": "3.11.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "eb173f5256d4022afba1e9bc3d19740a76859fae"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v3.11.3"
                  },
                  {
                    "range": [
                      {
                        "fixed": "dcd3d551ced8b8dc14e0217f8cb14e547109cd5f"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v3.5.3"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42151.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:40.628539123Z",
      "provider": "osv",
      "references": [
        "https://github.com/prometheus/prometheus/releases/tag/v3.11.3",
        "https://github.com/prometheus/prometheus/releases/tag/v3.5.3",
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42151.json",
        "https://access.redhat.com/errata/RHSA-2026:25039",
        "https://access.redhat.com/errata/RHSA-2026:25245",
        "https://access.redhat.com/errata/RHSA-2026:25504",
        "https://access.redhat.com/errata/RHSA-2026:34357",
        "https://access.redhat.com/errata/RHSA-2026:34359",
        "https://access.redhat.com/errata/RHSA-2026:36651",
        "https://access.redhat.com/errata/RHSA-2026:36796",
        "https://access.redhat.com/errata/RHSA-2026:36797",
        "https://access.redhat.com/errata/RHSA-2026:37267",
        "https://access.redhat.com/errata/RHSA-2026:37271",
        "https://access.redhat.com/errata/RHSA-2026:37272",
        "https://access.redhat.com/errata/RHSA-2026:40118",
        "https://access.redhat.com/errata/RHSA-2026:40262",
        "https://access.redhat.com/errata/RHSA-2026:40768",
        "https://access.redhat.com/errata/RHSA-2026:40945",
        "https://access.redhat.com/errata/RHSA-2026:40970",
        "https://access.redhat.com/errata/RHSA-2026:40972",
        "https://access.redhat.com/errata/RHSA-2026:40974",
        "https://access.redhat.com/errata/RHSA-2026:41019",
        "https://access.redhat.com/errata/RHSA-2026:41030",
        "https://access.redhat.com/errata/RHSA-2026:41031",
        "https://access.redhat.com/errata/RHSA-2026:41066",
        "https://access.redhat.com/errata/RHSA-2026:42146",
        "https://access.redhat.com/errata/RHSA-2026:42796",
        "https://access.redhat.com/errata/RHSA-2026:42852",
        "https://access.redhat.com/errata/RHSA-2026:43052",
        "https://access.redhat.com/errata/RHSA-2026:44622",
        "https://access.redhat.com/errata/RHSA-2026:47149",
        "https://access.redhat.com/errata/RHSA-2026:47952",
        "https://access.redhat.com/errata/RHSA-2026:50843",
        "https://access.redhat.com/errata/RHSA-2026:50874",
        "https://access.redhat.com/errata/RHSA-2026:53412",
        "https://access.redhat.com/errata/RHSA-2026:53413",
        "https://access.redhat.com/errata/RHSA-2026:53415",
        "https://access.redhat.com/errata/RHSA-2026:53530",
        "https://access.redhat.com/errata/RHSA-2026:54288",
        "https://access.redhat.com/errata/RHSA-2026:54427",
        "https://access.redhat.com/errata/RHSA-2026:56340",
        "https://access.redhat.com/errata/RHSA-2026:57191",
        "https://access.redhat.com/errata/RHSA-2026:60386",
        "https://access.redhat.com/errata/RHSA-2026:60387",
        "https://access.redhat.com/errata/RHSA-2026:60388",
        "https://access.redhat.com/errata/RHSA-2026:60389",
        "https://access.redhat.com/errata/RHSA-2026:60390",
        "https://access.redhat.com/errata/RHSA-2026:60391",
        "https://access.redhat.com/errata/RHSA-2026:60441",
        "https://access.redhat.com/errata/RHSA-2026:60477",
        "https://access.redhat.com/errata/RHSA-2026:63103",
        "https://access.redhat.com/security/cve/CVE-2026-42151",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42151.json",
        "https://github.com/prometheus/prometheus/security/advisories/GHSA-wg65-39gg-5wfj",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-42151",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2466507",
        "https://github.com/prometheus/prometheus/pull/18587",
        "https://github.com/prometheus/prometheus/pull/18590"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-200",
          "CWE-312"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42151.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-42151",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507981,
  "published_at": "2026-05-04T18:12:16.917+00:00"
}