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    "github_reviewed": true,
    "github_reviewed_at": "2026-05-05T21:53:18Z",
    "nvd_published_at": "2026-05-26T22:16:43Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nIn the Prometheus server\u0027s legacy web UI (enabled via the command-line flag `--enable-feature=old-ui`), the histogram heatmap chart view does not escape `le` label values when inserting them into the HTML for use as axis tick mark labels.\n\nAn attacker who can inject crafted metrics (e.g. via a compromised scrape target, remote write, or OTLP receiver endpoint) can execute JavaScript in the browser of any Prometheus user who views the metric in the heatmap chart UI. From the XSS context, an attacker could for example:\n\n- Read `/api/v1/status/config` to extract sensitive configuration (although credentials / secrets are redacted by the server)\n- Call `/-/quit` to shut down Prometheus (only if `--web.enable-lifecycle` is set)\n- Call `/api/v1/admin/tsdb/delete_series` to delete data (only if `--web.enable-admin-api` is set)\n- Exfiltrate metric data to an external server\n\nNote that this only affects users who have explicitly enabled the legacy Prometheus web UI using the `--enable-feature=old-ui` command-line flag.\n\n### Patches\n\nhttps://github.com/prometheus/prometheus/commit/38f23b9075ced1de2b82d2dad8b2bebb1ecd5b7d\n\n### Workarounds\n\nIf at all possible, disable the legacy web UI by removing the `--enable-feature=old-ui` command-line flag).\n\nIf this is not an option, take the following precautions:\n\n- If using the remote write receiver (`--web.enable-remote-write-receiver`), ensure it is not exposed to untrusted sources.\n- If using the OTLP receiver (`--web.enable-otlp-receiver`), ensure it is not exposed to untrusted sources.\n- Ensure scrape targets are trusted and not under attacker control.\n- Do not enable admin / mutating API endpoints (e.g. `--web.enable-admin-api` or `web.enable-lifecycle`) in cases where you cannot prevent untrusted data from being ingested.\n- Users should avoid clicking untrusted links, especially those containing functions such as `label_replace`, as they may generate poisoned label names and values.\n\n### References\n\n- CVE-2019-10215 \u2014 prior stored DOM XSS vulnerability in Prometheus query history, fixed in v2.7.2\n- CVE-2026-40179 \u2014 prior stored DOM XSS vulnerability in Prometheus web UI (hover tooltips and metrics explorer), fixed in v3.11.2",
  "id": "GHSA-fw8g-cg8f-9j28",
  "modified": "2026-06-08T23:34:45Z",
  "published": "2026-05-05T21:53:18Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/prometheus/prometheus/security/advisories/GHSA-fw8g-cg8f-9j28"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44903"
    },
    {
      "type": "WEB",
      "url": "https://github.com/prometheus/prometheus/commit/38f23b9075ced1de2b82d2dad8b2bebb1ecd5b7d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/prometheus/prometheus"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Prometheus vulnerable to stored XSS via crafted histogram bucket label values in the old web UI heatmap display"
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/prometheus/prometheus"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "last_affected": "3.5.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/prometheus/prometheus"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.6.0"
            },
            {
              "last_affected": "3.11.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/prometheus/prometheus"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.311.2-0.20260410083055-07c6232d159b"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40179"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-13T16:39:16Z",
    "nvd_published_at": "2026-04-15T23:16:09Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nStored cross-site scripting (XSS) via crafted metric names in the Prometheus web UI:\n\n* **Old React UI + New Mantine UI:** When a user hovers over a chart tooltip on the Graph page, metric names containing HTML/JavaScript are injected into `innerHTML` without escaping, causing arbitrary script execution in the user\u0027s browser.\n* **Old React UI only:** When a user opens the Metric Explorer (globe icon next to the PromQL expression input field), and a metric name containing HTML/JavaScript is rendered in the fuzzy search results, it is injected into `innerHTML` without escaping, causing arbitrary script execution in the user\u0027s browser.\n* **Old React UI only:** When a user views a heatmap chart and hovers over a cell, the `le` label values of the underlying histogram buckets are interpolated into `innerHTML` without escaping. While `le` is conventionally a numeric bucket boundary, Prometheus does not enforce this \u2014 arbitrary UTF-8 strings are accepted as label values, allowing script injection via a crafted scrape target or remote write.\n\nWith Prometheus v3.x defaulting to UTF-8 metric and label name validation, characters like `\u003c`, `\u003e`, and `\"` are now valid in metric names and labels, making this exploitable.\n\nAn attacker who can inject metrics (via a compromised scrape target, remote write, or OTLP receiver endpoint) can execute JavaScript in the browser of any Prometheus user who views the metric in the Graph UI. From the XSS context, an attacker could for example:\n\n- Read `/api/v1/status/config` to extract sensitive configuration (although credentials / secrets are redacted by the server)\n- Call `/-/quit` to shut down Prometheus (only if `--web.enable-lifecycle` is set)\n- Call `/api/v1/admin/tsdb/delete_series` to delete data (only if `--web.enable-admin-api` is set)\n- Exfiltrate metric data to an external server\n\nBoth the new Mantine UI and the old React UI are affected. The vulnerable code paths are:\n\n- `web/ui/mantine-ui/src/pages/query/uPlotChartHelpers.ts` \u2014 tooltip `innerHTML` with unescaped `labels.__name__`\n- `web/ui/react-app/src/pages/graph/GraphHelpers.ts` \u2014 tooltip content with unescaped `labels.__name__`\n- `web/ui/react-app/src/pages/graph/MetricsExplorer.tsx` \u2014 fuzzy search results rendered via `dangerouslySetInnerHTML` without sanitization\n- `web/ui/react-app/src/vendor/flot/jquery.flot.heatmap.js` \u2014 heatmap tooltip with unescaped label values\n\n### Patches\n\nA patch has been published in Prometheus 3.5.2 LTS and Prometheus 3.11.2. The fix applies `escapeHTML()` to all user-controlled values (metric names and label values) before inserting them into `innerHTML`. This advisory will be updated with the patched version once released.\n\n### Workarounds\n\n- If using the remote write receiver (`--web.enable-remote-write-receiver`), ensure it is not exposed to untrusted sources.\n- If using the OTLP receiver (`--web.enable-otlp-receiver`), ensure it is not exposed to untrusted sources.\n- Ensure scrape targets are trusted and not under attacker control.\n- Do not enable admin / mutating API endpoints (e.g. `--web.enable-admin-api` or `web.enable-lifecycle`) in cases where you cannot prevent untrusted data from being ingested.\n- Users should avoid clicking untrusted links, especially those containing functions such as label_replace, as they may generate poisoned label names and values.\n\n### Acknowledgements\n\nThanks to @gladiator9797 (Duc Anh Nguyen from TinyxLab) for reporting this.",
  "id": "GHSA-vffh-x6r8-xx99",
  "modified": "2026-04-27T16:21:30Z",
  "published": "2026-04-13T16:39:16Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/prometheus/prometheus/security/advisories/GHSA-vffh-x6r8-xx99"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40179"
    },
    {
      "type": "WEB",
      "url": "https://github.com/prometheus/prometheus/pull/18506"
    },
    {
      "type": "WEB",
      "url": "https://github.com/prometheus/prometheus/commit/07c6232d159bfb474a077788be184d87adcfac3c"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/prometheus/prometheus"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Prometheus has Stored XSS via metric names and label values in Prometheus web UI tooltips and metrics explorer"
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/prometheus/prometheus"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.45.2"
            },
            {
              "fixed": "0.311.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42151"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-312"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-05T19:33:47Z",
    "nvd_published_at": "2026-05-04T19:16:04Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nUsers who use Azure AD remote write with OAuth authentication are impacted.\n\nThe `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.\n\n### Patches\n\nThe problem has been patched by changing `ClientSecret` in `OAuthConfig` to `Secret`. Users should upgrade to 3.11.3 or 3.5.3 LTS.\n\n### Workarounds\n\nUsers  who can not upgrade can switch to Managed Identity or Workload Identity authentication for Azure AD remote write, which do not involve a client secret.",
  "id": "GHSA-wg65-39gg-5wfj",
  "modified": "2026-05-05T19:33:47Z",
  "published": "2026-05-05T19:33:47Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/prometheus/prometheus/security/advisories/GHSA-wg65-39gg-5wfj"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42151"
    },
    {
      "type": "WEB",
      "url": "https://github.com/prometheus/prometheus/pull/18587"
    },
    {
      "type": "WEB",
      "url": "https://github.com/prometheus/prometheus/pull/18590"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/prometheus/prometheus"
    },
    {
      "type": "WEB",
      "url": "https://github.com/prometheus/prometheus/releases/tag/v3.11.3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/prometheus/prometheus/releases/tag/v3.5.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Prometheus Azure AD remote write OAuth client secret exposed via config API"
}