TinyMCE Cross-Site Scripting (XSS) vulnerability using media plugin `data-mce-object` injection
### Impact Stored XSS vulnerability in the media plugin. Attackers can inject malicious scripts via crafted `data-mce-*` attributes, which are executed when content is rendered. Impacts users of TinyMCE with the media plugin enabled. ### Patches This vulnerability has been patched in TinyMCE 8.5.1, TinyMCE 7.9.3 and TinyMCE 5.11.1 LTS by ensuring that, when using the media plugin, any content with `data-mce-object` and `data-mce-p-*` attributes are properly sanitized. ### 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](https://www.tiny.cloud/long-term-support/) contract). ### Acknowledgements Tiny thanks [Aymane MAZGUITI](https://github.com/UncleJ4ck) and [Ange Primiterra](https://github.com/ange-primiterra) for their help identifying this vulnerability.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-47761US | medium5.4 | Exploit | ||
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 in the media plugin. Attackers can inject malicious scripts via c… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/tinymce/tinymcePACKAGE
- https://github.com/tinymce/tinymce/security/advisories/GHSA-vg35-5wq7-3x7wWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-47761ADVISORY
- https://www.tiny.cloud/docs/tinymce/7/7.9.3-release-notes/#overviewWEB
- https://www.tiny.cloud/docs/tinymce/8/8.5.1-release-notes/#overviewWEB
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