CVE-2026-104847 · GHSA-c8x8-7fp4-3x9w
ProseMirror has a XSS vulnerability in prosemirror-view's paste handling
- Risk score
- 65/100
- CVSS
- 8.5 v4.0
- Exploit chance (30 days)
- 0.3%
- Published
- 2 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 cr…
- Affected
- prosemirror-view (npm) < 1.42.3
- Fix
- Upgrade prosemirror-view to 1.42.3 or later.
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 8.5 high
- Remotely exploitable without logging in
- On your watchlist: npm
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| prosemirror-view | npm | < 1.42.3 | 1.42.3 |
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
- https://github.com/advisories/GHSA-c8x8-7fp4-3x9w
Original 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.
Last activity 2 Oct 2026. Patch Forecast updates every hour.