TinyMCE XSS vulnerability in notificationManager.open API
Impact
A cross-site scripting (XSS) vulnerability was discovered in TinyMCE’s Notification Manager API. The vulnerability exploits TinyMCE's unfiltered notification system, which is used in error handling. The conditions for this exploit requires carefully crafted malicious content to have been inserted into the editor and a notification to have been triggered.
When a notification was opened, the HTML within the text argument was displayed unfiltered in the notification. The vulnerability allowed arbitrary JavaScript execution when an notification presented in the TinyMCE UI for the current user. This issue could also be exploited by any integration which uses a TinyMCE notification to display unfiltered HTML content.
Patches
This vulnerability has been patched in TinyMCE 5.10.8 and TinyMCE 6.7.1 by ensuring that the HTML displayed in the notification is sanitized, preventing the exploit.
Fix
To avoid this vulnerability:
- Upgrade to TinyMCE 5.10.8 or higher for TinyMCE 5.x.
- Upgrade to TinyMCE 6.7.1 or higher for TinyMCE 6.x.
References
- https://tiny.cloud/docs/release-notes/release-notes5108/#securityfixes
- https://tiny.cloud/docs/tinymce/6/6.7.1-release-notes/#security-fixes
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 | >= 6.0.0, < 6.7.1, < 5.10.8 | 6.7.1, 5.10.8 |
| Paquete de npm | tinymce | >= 6.0.0, < 6.7.1, < 5.10.8 | 6.7.1, 5.10.8 |
| .NET (NuGet) | TinyMCE | >= 6.0.0, < 6.7.1, < 5.10.8 | 6.7.1, 5.10.8 |
Referencias
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N- Debilidad (CWE)
CWE-79- Plataforma
- Composer, npm, .NET (NuGet)
- Paquete
tinymce/tinymce, tinymce, TinyMCE- Publicada
- 19.10.2023
- Actualizado
- 11.10.2026 11:17
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-hgqx-r2hp-jr38 - CC BY 4.0
Historial de vulnerabilidades: tinymce
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 20
- Primera → última
- 01.2020 06.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 5
- Media 14
- Baja 1
Divulgaciones por año
- 2020: 3
- 2021: 5
- 2022: 1
- 2023: 3
- 2024: 4
- 2025: 0
- 2026: 4
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TinyMCE XSS vulnerability in notificationManager.open API esta entrada
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