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CVE-2026-104847— ProseMirror: XSS vulnerability in prosemirror-view's paste handling

Quick assessment

Affected
ProseMirror prosemirror-view
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.

ProseMirror 的视图组件负责渲染和管理 ProseMirror 文档的可编辑浏览器界面。在 1.42.3 版本之前，prosemirror-view 的粘贴处理功能会接受攻击者提供的 HTML 内容，其中剪贴板切片上下文包含的某些属性未通过 schema 属性验证。当用户将精心构造的 HTML 粘贴到编辑器中时，这些未经校验的上下文属性可能生成包含攻击者控制的 JavaScript 代码的内容，从而在包含编辑器的浏览器窗口中执行恶意脚本。该问题已在 1.42.3 版本中得到修复。

CVSS 8.5 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
ProseMirror prosemirror-view < 1.42.3 affected
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I. Basic Information for CVE-2026-104847

Vulnerability Information
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Vulnerability Title
ProseMirror: XSS vulnerability in prosemirror-view's paste handling
Source: CVE Program / CVE List V5
Vulnerability Description
ProseMirror's view component renders and manages the editable browser interface for ProseMirror documents. Prior to 1.42.3, prosemirror-view paste handling accepts attacker-provided HTML whose clipboard slice context contains attributes that are not passed through schema attribute validation. When a user pastes the crafted HTML into an editor, the unvalidated context attributes can construct content that executes attacker-controlled JavaScript in the browser window containing the editor. This issue is fixed in version 1.42.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA: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
ProseMirror prosemirror-view < 1.42.3 -

II. Public POCs for CVE-2026-104847

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-104847

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Patches & Fixes for CVE-2026-104847 (2)

Vendor Advisories for CVE-2026-104847 (1)

IV. Related Vulnerabilities

Same weakness: CWE-79

V. Comments for CVE-2026-104847

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