Executive brief
TinyMCE, a widely used rich text editor for web applications, contains a vulnerability in its media plugin. An attacker can embed malicious scripts into content that, when viewed by other users, could allow the attacker to steal sensitive information or perform actions on the user's behalf. This affects any application using TinyMCE with the media plugin enabled.
Technical details
A stored cross-site scripting (XSS) vulnerability exists in the TinyMCE media plugin. The root cause is the improper neutralization of user-controllable input within 'data-mce-object' and 'data-mce-p-*' attributes. An attacker with low privileges can inject malicious scripts via these crafted attributes, which are then executed in the context of the victim's browser when the content is rendered. The vulnerability has been patched in versions 8.5.1, 7.9.3, and 5.11.1 LTS by implementing proper sanitization for these specific attributes.
Affected products
- TinyMCE tinymce < 5.11.1, >= 6.0.0, < 7.9.3, >= 8.0.0, < 8.5.1
Timeline
- 2026-05-20: disclosed
- 2026-05-28: advisory: NVD publication date
- 2026-06-05: advisory: GitHub Advisory reviewed