Cross-site scripting vulnerability in TinyMCE plugins
Impact
A cross-site scripting (XSS) vulnerability was discovered in the URL processing logic of the image and link plugins. The vulnerability allowed arbitrary JavaScript execution when updating an image or link using a specially crafted URL. This issue only impacted users while editing and the dangerous URLs were stripped in any content extracted from the editor. This impacts all users who are using TinyMCE 5.9.2 or lower.
Patches
This vulnerability has been patched in TinyMCE 5.10.0 by improved sanitization logic when updating URLs in the relevant plugins.
Workarounds
To work around this vulnerability, either:
- Upgrade to TinyMCE 5.10.0 or higher
- Disable the
imageandlinkplugins
Acknowledgements
Tiny Technologies would like to thank Yakir6 for discovering this vulnerability.
References
https://www.tiny.cloud/docs/release-notes/release-notes510/#securityfixes
For more information
If you have any questions or comments about this advisory:
- Email us at infosec@tiny.cloud
- Open an issue in the TinyMCE repo
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de Composer | tinymce/tinymce | < 5.10.0 | 5.10.0 |
| Paquete de npm | tinymce | < 5.10.0 | 5.10.0 |
| .NET (NuGet) | TinyMCE | < 5.10.0 | 5.10.0 |
| Python (PyPI) | django-tinymce | < 3.4.0 | 3.4.0 |
Referencias
- https://github.com/tinymce/tinymce/security/advisories/GHSA-r8hm-w5f7-wj39
- https://github.com/jazzband/django-tinymce/issues/366
- https://github.com/jazzband/django-tinymce/releases/tag/3.4.0
- https://github.com/tinymce/tinymce
- https://pypi.org/project/django-tinymce/3.4.0
- https://pypi.org/project/django-tinymce
- https://github.com/advisories/GHSA-r8hm-w5f7-wj39
- https://nvd.nist.gov/vuln/detail/CVE-2024-21910
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N- Debilidad (CWE)
CWE-64, CWE-79- Plataforma
- Composer, npm, .NET (NuGet), Python (PyPI)
- Paquete
tinymce/tinymce, tinymce, TinyMCE- Publicada
- 02.11.2021
- Actualizado
- 11.10.2026 13:17
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-r8hm-w5f7-wj39 - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-632 - PyPA Advisory Database; CC BY 4.0
Historial de vulnerabilidades: tinymce/tinymce
Todas las vulnerabilidades publicadas de este paquete (Paquete de Composer), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 15
- Primera → última
- 01.2021 06.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 4
- Media 11
Divulgaciones por año
- 2021: 3
- 2022: 1
- 2023: 3
- 2024: 4
- 2025: 0
- 2026: 4
-
Cross-site scripting vulnerability in TinyMCE plugins esta entrada
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