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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
Active
User action required
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 3
https://github.com/ProseMirror/prosemirror-view/commit/20dc0a911a79f8fc6640dbbe…
security-advisories@github.com
https://github.com/ProseMirror/prosemirror-view/commit/2e91a612bbc1248e55b4f606…
security-advisories@github.com
https://github.com/ProseMirror/prosemirror-view/security/advisories/GHSA-c8x8-7…
security-advisories@github.com