TinyMCE up to 5.11.0/6.8.6/7.9.2/8.5.0 data-mce-href/data-mce-src/data-mce-style cross site scripting

Summaryinfo

A vulnerability described as problematic has been identified in TinyMCE up to 5.11.0/6.8.6/7.9.2/8.5.0. Affected by this vulnerability is an unknown functionality. Executing a manipulation of the argument data-mce-href/data-mce-src/data-mce-style can lead to cross site scripting. The identification of this vulnerability is CVE-2026-47759. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in TinyMCE up to 5.11.0/6.8.6/7.9.2/8.5.0. It has been declared as problematic. This vulnerability affects an unknown code block. The manipulation of the argument data-mce-href/data-mce-src/data-mce-style with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect integrity. CVE summarizes:

TinyMCE is an open source rich text editor. Prior to 5.11.1, 7.9.3, and 8.5.1, there is a 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. This vulnerability is fixed in 5.11.1, 7.9.3, and 8.5.1.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-47759 since 05/20/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

The vulnerability scanner Nessus provides a plugin with the ID 318085 (Linux Distros Unpatched Vulnerability : CVE-2026-47759), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.11.1, 7.9.3 or 8.5.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (318085) and EUVD (EUVD-2026-32921). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• TinyMCE

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.5
• 5.6
• 5.7
• 5.8
• 5.9
• 5.10
• 5.11.0
• 6.8.0
• 6.8.1
• 6.8.2
• 6.8.3
• 6.8.4
• 6.8.5
• 6.8.6
• 7.9.0
• 7.9.1
• 7.9.2
• 8.0
• 8.1
• 8.2
• 8.3
• 8.4
• 8.5.0

Website

• Product: https://github.com/tinymce/tinymce/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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