Summary
ProseMirror has a XSS vulnerability in prosemirror-view's paste handling
Advisory details
Impact
When a user pastes attacker-provided HTML into a ProseMirror editor component, this can cause attacker-controlled JavaScript code to run in the browser window containing the editor.
Patches
Version 1.42.3 adds validation that prevents this attack.
Workarounds
No known workarounds.
References
- https://github.com/advisories/GHSA-c8x8-7fp4-3x9w
- https://github.com/ProseMirror/prosemirror-view/security/advisories/GHSA-c8x8-7fp4-3x9w
- https://nvd.nist.gov/vuln/detail/CVE-2026-104847
- https://github.com/ProseMirror/prosemirror-view/commit/20dc0a911a79f8fc6640dbbea5e7d68d3c4784b7
- https://github.com/ProseMirror/prosemirror-view/commit/2e91a612bbc1248e55b4f6061fc93fe459f977c1
Related vulnerabilities
All Supply chain →- CRITICALCVE-2026-102989
TanStack Router: Unauthenticated reflected XSS in TanStack Start server-function responses
- CRITICALCVE-2026-104252
Vitess vttablet /twopcz reflected XSS
- MEDIUMCVE-2026-104250
unstructured: Stored XSS via unescaped HTML generation
- HIGHCVE-2026-96230
Microsoft Security Advisory CVE-2026-96230 - ASP.NET Core Remote Code Execution Vulnerability
- HIGHCVE-2026-108260
@tinacms/web-components: `tina-markdown` writes rich-text link URLs into `href` without scheme validation, allowing stored XSS
- CRITICALCVE-2026-107845
Contao: Cross-site scripting in the comments bundle