MediumGHSA-hgqx-r2hp-jr38CVE-2023-45819

TinyMCE XSS vulnerability in notificationManager.open API

Published 19 Oct 2023 · Updated 16 Feb 2024

Affected packages

tinymcenpm
Affected
>=6.0.0 <6.7.1
Fixed in
6.7.1
Update to the fixed version for your release line, for example:npm install tinymce@6.7.1
tinymce/tinymceComposer
Affected
>=6.0.0 <6.7.1
Fixed in
6.7.1
Update to the fixed version for your release line, for example:composer require tinymce/tinymce:^6.7.1
tinymcenpm
Affected
<5.10.8
Fixed in
5.10.8
Update to the fixed version for your release line, for example:npm install tinymce@5.10.8
tinymce/tinymceComposer
Affected
<5.10.8
Fixed in
5.10.8
Update to the fixed version for your release line, for example:composer require tinymce/tinymce:^5.10.8

Details

Impact

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.

Patches

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.

Fix

To avoid this vulnerability:

  • Upgrade to TinyMCE 5.10.8 or higher for TinyMCE 5.x.
  • Upgrade to TinyMCE 6.7.1 or higher for TinyMCE 6.x.

References

  • <https://tiny.cloud/docs/release-notes/release-notes5108/#securityfixes>
  • <https://tiny.cloud/docs/tinymce/6/6.7.1-release-notes/#security-fixes>

For more information

If you have any questions or comments about this advisory:

  • Email us at <infosec@tiny.cloud>
  • Open an issue in the TinyMCE repo

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References

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.