ProseMirror View up to 1.42.2 Paste cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, has been found in ProseMirror View up to 1.42.2. Affected by this issue is some unknown functionality of the component Paste Handler. The manipulation leads to cross site scripting. This vulnerability is listed as CVE-2026-104847. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in ProseMirror View up to 1.42.2. This issue affects an unknown functionality of the component Paste Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE 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 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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-104847 since 10/02/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 1.42.3 eliminates this vulnerability.

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Productinfo

Vendor

• ProseMirror

Name

• View

Version

• 1.42.0
• 1.42.1
• 1.42.2

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CPE 2.2info

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