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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
Vulnerability Title
Milkdown 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Milkdown milkdown是Milkdown组织的一个基于Markdown的富文本编辑器。 Milkdown 7.21.3之前版本存在跨站脚本漏洞，该漏洞源于@milkdown/plugin-emoji包中存在DOM跨站脚本漏洞，parseDOM.getAttrs处理粘贴的span元素原始innerHTML时未进行清理，且toMarkdown直接将其赋值给innerHTML，绕过DOMPurify清理，可能导致未经身份验证的攻击者通过用户粘贴攻击者控制的内容在主机应用源中执行任意JavaScrip
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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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