Cross-site Scripting vulnerability in TinyMCE notificationManager.open API

Summary

TinyMCE is an open source rich text editor. A cross-site scripting (XSS) vulnerability was discovered in TinyMCE’s Notification Manager API. The vulnerability exploits TinyMCE's unfiltered notification system, which is used in error handling. The conditions for this exploit requires carefully crafted malicious content to have been inserted into the editor and a notification to have been triggered. When a notification was opened, the HTML within the text argument was displayed unfiltered in the notification. The vulnerability allowed arbitrary JavaScript execution when an notification presented in the TinyMCE UI for the current user. This issue could also be exploited by any integration which uses a TinyMCE notification to display unfiltered HTML content. This vulnerability has been patched in TinyMCE 5.10.8 and TinyMCE 6.7.1 by ensuring that the HTML displayed in the notification is sanitized, preventing the exploit. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Timeline

1. Oct 19, 2023, 9:13 PM UTCCVE published
2. Sep 12, 2024, 5:48 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Sep 12, 2024, 5:49 PM UTCRecord last updated

Affected versions

• tinymce tinymce

  fixed in 5.10.8; From 6.0.0 · fixed in 6.7.1

• tinymcenpm

  From 6.0.0 · fixed in 6.7.1

• TinyMCENuGet

  From 6.0.0 · fixed in 6.7.1

• tinymce/tinymcePackagist

  From 6.0.0 · fixed in 6.7.1

• tinymcenpm

  fixed in 5.10.8

• TinyMCENuGet

  fixed in 5.10.8

• tinymce/tinymcePackagist

  fixed in 5.10.8

References 1