Vulnerabilities in pkg:npm/mathlive

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fm7p-gw32-828p",
  "modified" : "2026-07-29T17:21:26Z",
  "published" : "2026-07-29T17:21:26Z",
  "aliases" : [ "CVE-2026-54705" ],
  "summary" : "mathlive's Lack of Escaping of HTML allows for XSS",
  "details" : "### Summary\n\nDespite the 0.104.0 patch escaping attribute-bearing constructs (`\\htmlData`, `\\href`), text-content reflection was missed. The `\\text{}`, `\\mbox{}` commands accept arbitrary characters in their body and emit them raw and unescaped into both the HTML markup and the MathML output, leading to XSS.\n\n### Details\n\n`Box.toMarkup` at `src/core/box.ts:356` concatenates `this.value` into the rendered span without HTML-escaping. In text mode any literal character (`<`, `>`, `&`, `\"`) is wrapped into a `TextAtom` whose `value` is the raw codepoint and lands in the markup unchanged. The MathML serializer at `src/formats/atom-to-math-ml.ts` is independently broken: `xmlEscape` deliberately omits the `&` rule, and `scanText`, `case 'text'`, and the `mode === 'text'` early return all emit `atom.value` raw.\n\nBoth outputs flow into `innerHTML` sinks via the public API. `<math-span>` / `<math-div>` (`src/public/math-static-elements.ts:331,407`) bypass `MathfieldElement.createHTML` entirely. The editor and SSR paths route through `createHTML`, but its default value is the identity function (`src/public/mathfield-element.ts:789`).\n\n### PoC\n\n1. Go to https://mathlive.io/mathfield/demo/\n2. open DevTools console and paste:\n\n```js\nconst s = document.createElement('math-span');\ns.style.display = 'block';\ns.textContent = '\\\\text{<img src=x onerror=alert(1)>}';\ndocument.body.appendChild(s);\ns.scrollIntoView();\n```\n\nEquivalent payloads: `\\mbox{<img src=x onerror=alert(1)>}`\n\nor\n\n```js\nimport { convertLatexToMarkup } from 'mathlive';\ndocument.body.innerHTML = convertLatexToMarkup('\\\\text{<img src=x onerror=alert(1)>}');\n```\n\n### Impact\n\nMathLive users who render untrusted mathematical expressions can encounter malicious input that runs arbitrary JavaScript.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "mathlive"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.110.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.109.2"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/arnog/mathlive/security/advisories/GHSA-fm7p-gw32-828p"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/arnog/mathlive/issues/3028"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/arnog/mathlive/commit/5fe1c46153883f9ec0249a5c8c34e64aaae9cfb8"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/arnog/mathlive"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-116" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-29T17:21:26Z",
    "nvd_published_at" : null
  }
}