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CVE-2026-57531— Milkdown < 7.21.3 DOM XSS via innerHTML Assignment

CVSS 5.4 · Medium EPSS 0.25% · P16

Affected Version Matrix 1

VendorProductVersion RangeStatus
Milkdownmilkdown< 7.21.3affected
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I. Basic Information for CVE-2026-57531

Vulnerability Information
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Vulnerability Title
Milkdown < 7.21.3 DOM XSS via innerHTML Assignment
Source: CVE Program / CVE List V5
Vulnerability Description
Milkdown before 7.21.3 contains a DOM cross-site scripting vulnerability in the @milkdown/plugin-emoji package that allows unauthenticated attackers to execute arbitrary JavaScript in the host application's origin by causing a victim to paste attacker-controlled content. The parseDOM.getAttrs handler stores raw innerHTML of pasted span elements with data-type="emoji" without sanitization, and the toMarkdown runner subsequently assigns this unsanitized value directly to a live DOM element's innerHTML, bypassing the DOMPurify sanitization used in the toDOM path, causing payload execution on every markdown serialization cycle.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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

VendorProductAffected VersionsCPESubscribe
Milkdownmilkdown 0 ~ 7.21.3 -

II. Public POCs for CVE-2026-57531

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III. Intelligence Information for CVE-2026-57531

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Patches & Fixes for CVE-2026-57531 (2)

Vendor Advisories for CVE-2026-57531 (1)

Vendor Pages for CVE-2026-57531 (1)

IV. Related Vulnerabilities

Same product: milkdown
Same vendor: Milkdown
Same weakness: CWE-79

V. Comments for CVE-2026-57531

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