Server side cross-site scripting In tinymce
Description
TinyMCE Cross-Site Scripting (XSS) vulnerability using through data-mce- prefixed src, href, style attributes
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.
Mitigation
Update Impact
Minimal update. May introduce new vulnerabilities or breaking changes.
Ecosystem | Package | Affected version | Patched versions |
|---|---|---|---|
 nuget | 5.11.1, 7.9.3, 8.5.1 | ||
 packagist | 7.9.3, 8.5.1 | ||
 npm | 7.9.3, 8.5.1 |
Aliases
References