{"id":"EUVD-2026-83198","enisaUuid":"068f0113-47e4-3e85-a1c5-6e3ff4c89e63","description":"md-editor-v3 is a Markdown editor for Vue 3 developed in JSX and TypeScript. Prior to 6.5.4, MdPreview\u0027s 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","datePublished":"Sep 18, 2026, 5:10:08 PM","dateUpdated":"Sep 18, 2026, 6:06:19 PM","baseScore":6.1,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","references":"https://github.com/imzbf/md-editor-v3/security/advisories/GHSA-3rm2-h79c-8qw6\nhttps://github.com/imzbf/md-editor-v3/commit/2c07360420e74087f5bc63032ab155d93e0a0b10\nhttps://github.com/imzbf/md-editor-v3/releases/tag/v6.5.4\n","aliases":"CVE-2026-84992\nGHSA-3rm2-h79c-8qw6\n","assigner":"GitHub_M","epss":0.33,"enisaIdProduct":[{"id":"54dc8462-888b-3b16-93ac-5f1e81ea1922","product":{"name":"md-editor-v3","vendor":{"name":"imzbf"}},"product_version":"\u003c 6.5.4"}],"enisaIdVendor":[{"id":"807fc828-8e67-37c7-bfaa-9ade0929b7cf","vendor":{"name":"imzbf"}}],"enisaIdVulnerability":[{"id":"45dd1bab-7758-37f0-8ae2-3989faecffd4","vulnerability":{"id":"GHSA-3rm2-h79c-8qw6","description":"md-editor-v3: XSS via fenced-code language rendering bypass","datePublished":"Sep 18, 2026, 5:17:36 PM","dateUpdated":"Sep 18, 2026, 5:17:36 PM","baseScore":0.0,"references":"https://github.com/imzbf/md-editor-v3/security/advisories/GHSA-3rm2-h79c-8qw6\nhttps://github.com/imzbf/md-editor-v3/commit/2c07360420e74087f5bc63032ab155d93e0a0b10\nhttps://github.com/imzbf/md-editor-v3\nhttps://github.com/imzbf/md-editor-v3/releases/tag/v6.5.4\n","enisa_id":"EUVD-2026-83198\n","aliases":"CVE-2026-84992\nGHSA-3rm2-h79c-8qw6\n","epss":0.0,"dataProcessed":"Nov 1, 2026, 2:06:27 AM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}},{"id":"cc0d6d9c-6c1f-354f-928a-22342ca8dbb1","vulnerability":{"id":"CVE-2026-84992","description":"md-editor-v3 is a Markdown editor for Vue 3 developed in JSX and TypeScript. Prior to 6.5.4, MdPreview\u0027s 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","datePublished":"Sep 18, 2026, 5:10:08 PM","dateUpdated":"Sep 18, 2026, 6:06:19 PM","status":"PUBLISHED","baseScore":6.1,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","references":"https://github.com/imzbf/md-editor-v3/security/advisories/GHSA-3rm2-h79c-8qw6\nhttps://github.com/imzbf/md-editor-v3/commit/2c07360420e74087f5bc63032ab155d93e0a0b10\nhttps://github.com/imzbf/md-editor-v3/releases/tag/v6.5.4\n","enisa_id":"EUVD-2026-83198\n","assigner":"GitHub_M","epss":0.33,"dataProcessed":"Nov 7, 2026, 7:16:50 AM","vulnerabilityProduct":[{"id":"1f2917c6-d772-3930-a363-f9c80b9fe634","product":{"name":"md-editor-v3","vendor":{"name":"imzbf"}},"product_version":"\u003c 6.5.4"}],"vulnerabilityVendor":[{"id":"ed46d3cb-c860-3410-9a4e-56e9af2010f1","vendor":{"name":"imzbf"}}]}}],"enisaIdAdvisory":[]}