{"schema":"threatline.record/2","record":{"id":"CVE-2026-113654","aliases":["GHSA-x3q4-9hxx-gx8m"],"summary":"ApostropheCMS sanitize-html: nonTextTags discard region ends early on an implied close, letting <noscript> content render","details":"## Summary\n\n`sanitize-html` discards the *content* of every element in `nonTextTags`. It delimits that region\nusing htmlparser2's close events, and ignores the `isImplied` flag htmlparser2 passes it. Closing a\nstill-open **ancestor** from inside a `<noscript>` makes htmlparser2 unwind its stack past the\n`noscript`; the synthetic implied close it emits on the way ends the discard region early, and\neverything after it is treated as ordinary body content.\n\nA browser with scripting enabled parses `<noscript>` content as **raw text**, so the same markup\nrenders as inert text there. The sanitizer therefore emits elements the page itself would not have.\n\n## Reproduction\n\n```js\nconst sanitizeHtml = require(\"sanitize-html\");\n\nsanitizeHtml('<div><noscript></div><img src=\"http://evil.test/t.gif\"></noscript>', {\n  allowedTags: [\"div\", \"img\"],\n  allowedAttributes: { img: [\"src\"] },\n  nonTextTags: [\"script\", \"style\", \"textarea\", \"option\", \"noscript\"],\n});\n// => '<div></div><img src=\"http://evil.test/t.gif\" />'\n```\n\nChrome, given the same input, renders **no** `<img>` — the whole payload is raw text inside the\nunclosed `<noscript>`. Verified with Playwright, `srcdoc` into an iframe so the scripting flag is on.\n\nA `<![CDATA[` variant hides the opening tag from the parser entirely and has the same effect:\n\n```\n<p>Hi</p><![CDATA[ x > <noscript>]]><a href=\"…\">Reset your password</a><img src=\"…beacon.gif\"></noscript>\n```\n\nhtmlparser2 runs a CDATA token to `]]>`; Chrome ends a bogus comment at the first `>`, so the\n`<noscript>` after it is real to the browser and invisible to the parser.\n\n## Where the behaviour is\n\n`index.js`:\n\n- `:154` — `nonTextTagsArray` (the default list, `['script','style','textarea','option','xmp']`).\n- `:638` — `onclosetag: function (name, isImplied)` — receives the flag.\n- `:644` — `skipTextDepth--` — decrements without consulting `isImplied`.\n\n## Suggested fix\n\nDo not end a discard region on an implied close. htmlparser2 already distinguishes them; the flag\nis passed and discarded. Something close to:\n\n```js\nonclosetag: function (name, isImplied) {\n  if (skipText) {\n    if (isImplied) return;   // an implied close must not end the region\n    skipTextDepth--;\n    …\n```","categories":["Libraries & packages"],"product":"sanitize-html","vendor":"apostrophecms","ecosystem":"npm","affected_ranges":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-x3q4-9hxx-gx8m","source_modified_at":"2026-10-20T18:03:24Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"sanitize-html"},"range":"< 2.18.0"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-113654","source_modified_at":"2026-10-20T16:35:55.161Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"apostrophe","vendor":"apostrophecms","versions":[{"version":"< 4.33.0","status":"affected"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-113654","source_modified_at":"2026-10-20T16:35:55.161Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"sanitize-html","vendor":"apostrophecms","versions":[{"version":"< 2.18.0","status":"affected"}],"defaultStatus":null},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-x3q4-9hxx-gx8m","source_modified_at":"2026-10-20T18:15:04.513263654Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"sanitize-html","purl":"pkg:npm/sanitize-html"},"ranges":[{"events":[{"introduced":"0"},{"fixed":"2.18.0"}],"type":"SEMVER"}],"versions":[]}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-x3q4-9hxx-gx8m","source_modified_at":"2026-10-20T18:03:24Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"sanitize-html"},"version":"2.18.0"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-x3q4-9hxx-gx8m","source_modified_at":"2026-10-20T18:15:04.513263654Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"sanitize-html","purl":"pkg:npm/sanitize-html"},"version":"2.18.0"}],"cvss":5.3,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00349,"percentile":0.27267,"score_date":"2026-10-23"},"published_at":"2026-10-20T16:35:55.161Z","modified_at":"2026-10-20T18:15:04.513263654Z","provenance":[{"source":"GitHub Advisory Database","url":"https://github.com/advisories/GHSA-x3q4-9hxx-gx8m","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-20T18:03:24Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-113654","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-20T16:35:55.161Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-x3q4-9hxx-gx8m","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-20T18:15:04.513263654Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-113654","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["GitHub Advisory Database","CVE List","OSV","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-x3q4-9hxx-gx8m","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed0943845ce","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130b350","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/apostrophecms/apostrophe/releases/tag/sanitize-html@2.18.0","tags":["x_refsource_MISC"]},{"url":"https://github.com/advisories/GHSA-x3q4-9hxx-gx8m","source":"GitHub Advisory Database"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"ecosystem","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-20T18:15:04.513263654Z","content_hash":"96223281beb59dd7cff543cca703c6754dcd1426e4e39bdcea39deb66105c930"}}