{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@excalidraw/excalidraw"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.18.0"
            },
            {
              "fixed": "0.18.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.18.0"
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@excalidraw/mermaid-to-excalidraw"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.3.0"
            },
            {
              "fixed": "1.1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-1395",
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-24T20:41:51Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\n\n`@excalidraw/excalidraw@0.18.0` depends on a Mermaid conversion package version that resolves to a Mermaid release affected by CVE-2025-54881 / GHSA-7rqq-prvp-x9jh. User-supplied Mermaid sequence diagram labels could trigger XSS through Mermaid\u2019s KaTeX label rendering path.\n\nThis is patched in `@excalidraw/excalidraw@0.18.1` by updating `@excalidraw/mermaid-to-excalidraw` to `2.2.2`, which uses a patched Mermaid 11 release.\n\nModerate severity as this XSS requires manual user action - pasting unsafe Mermaid diagram into the Excalidraw editor. No semi-automated attack vector exists by default (such as accessing a link).\n\n### Patches\n\n- Stable `@excalidraw/excalidraw@0.18.1` is patched.\n- Unstable `@excalidraw/excalidraw@next` has resolved to patched builds since `@excalidraw/excalidraw@0.18.0-f29edf` on 2025-08-21.\n- Direct consumers of `@excalidraw/mermaid-to-excalidraw` should use `1.1.3` or later.\n\n### Workarounds\n\nNone.\n\n### Resources\n\n- Upstream Mermaid advisory: https://github.com/mermaid-js/mermaid/security/advisories/GHSA-7rqq-prvp-x9jh\n- CVE-2025-54881",
  "id": "GHSA-39h7-pwv7-rc3x",
  "modified": "2026-04-24T20:41:51Z",
  "published": "2026-04-24T20:41:51Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/excalidraw/excalidraw/security/advisories/GHSA-39h7-pwv7-rc3x"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mermaid-js/mermaid/security/advisories/GHSA-7rqq-prvp-x9jh"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/excalidraw/excalidraw"
    },
    {
      "type": "WEB",
      "url": "https://github.com/excalidraw/excalidraw/releases/tag/v0.18.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [],
  "summary": "Excalidraw vulnerable to XSS via Mermaid sequence diagram labels (KaTeX rendering)"
}