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CVE-2026-84992— md-editor-v3: XSS via fenced-code language rendering bypass

Quick assessment

Affected
imzbf md-editor-v3
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 la

CVSS 6.1 · Medium
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I. Basic Information for CVE-2026-84992

Vulnerability Information

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Vulnerability Title
md-editor-v3: XSS via fenced-code language rendering bypass
Source: CVE Program / CVE List V5
Vulnerability 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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
imzbf md-editor-v3 < 6.5.4 -

II. Public POCs for CVE-2026-84992

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III. Intelligence Information for CVE-2026-84992

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Patches & Fixes for CVE-2026-84992 (1)

Other References for CVE-2026-84992 (2)

IV. Related Vulnerabilities

Same weakness: CWE-79

V. Comments for CVE-2026-84992

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