GHSA-q742-qvgc-gc2fHighCVSS 8.7

TinyMCE Cross-Site Scripting (XSS) vulnerability using through data-mce- prefixed src, href, style attributes

Published
June 5, 2026
Last Modified
June 5, 2026

🔗 CVE IDs covered (1)

CVE-2026-47759 →

📋 Description

Impact

Stored XSS vulnerability via unsanitized data-mce-* attributes (data-mce-href, data-mce-src, data-mce-style). Allows attackers to inject malicious values that override safe attributes during serialization, bypassing validation.

Patches

Patched by stripping unsafe data-mce-* attributes during parsing. Users should upgrade to the latest patched versions (5 LTS, 7.x, 8.x).

Workarounds

No official workaround available.

Fix

To avoid this vulnerability:

Upgrade to TinyMCE 8.5.1 or higher. Upgrade to TinyMCE 7.9.3 or higher. Upgrade to TinyMCE 5.11.1 LTS or higher for TinyMCE 5.x (only available as part of commercial long-term support contract).

Acknowledgements

Tiny thanks Tadi Kadango (website) and Ivan Babenko for their help identifying this vulnerability.

🎯 Affected products9

  • npm/tinymce:< 5.11.1
  • npm/tinymce:>= 6.0.0, < 7.9.3
  • npm/tinymce:>= 8.0.0, < 8.5.1
  • nuget/TinyMCE:< 5.11.1
  • nuget/TinyMCE:>= 6.0.0, < 7.9.3
  • nuget/TinyMCE:>= 8.0.0, < 8.5.1
  • composer/tinymce/tinymce:< 5.11.1
  • composer/tinymce/tinymce:>= 6.0.0, < 7.9.3
  • composer/tinymce/tinymce:>= 8.0.0, < 8.5.1

🔗 References (5)