Craft CMS Vulnerable to Stored XSS via User Group Name in User Permissions Page
Summary
A stored XSS vulnerability exists in the User Permissions page. The User Group name is rendered without proper HTML escaping in the permissions section, allowing an attacker to execute arbitrary JavaScript when another user views or edits a user's permissions.
[!NOTE] This is a separate vulnerability from the previously reported "Stored XSS via User Group Name in User Settings Page" and "Multiple Stored XSS in User Group Edit Page". This affects a different sink: the individual user's permissions page.
Proof of Concept
Required Permissions
- Admin access
allowAdminChangesis enabled in production, which is against our security recommendations.
Steps to Reproduce
- Log in to the control panel as an admin
- Navigate to Settings → Users → User Groups
- Create or edit a user group and set the Name field to:
html
<img src=x onerror="alert('XSS')" hidden> - Save the user group
- Navigate to Users and edit any user (
/admin/users/{id}) - Click on the Permissions tab
- XSS executes
Mitigation
Sanitize user group names when rendering in the user permissions template.
References
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de Composer | craftcms/cms | >= 5.0.0-RC1, < 5.8.22 | 5.8.22 |
Referencias
- https://github.com/craftcms/cms/security/advisories/GHSA-g3hp-vvqf-8vw6
- https://nvd.nist.gov/vuln/detail/CVE-2026-56381
- https://github.com/craftcms/cms
- https://github.com/craftcms/cms/releases/tag/5.8.22
- https://www.vulncheck.com/advisories/craft-cms-stored-xss-via-user-group-name-in-user-permissions-page
- Vector CVSS
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P- Debilidad (CWE)
CWE-79- Plataforma
- Composer
- Paquete
craftcms/cms- Publicada
- 11.03.2026
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-g3hp-vvqf-8vw6 - CC BY 4.0
Historial de vulnerabilidades: craftcms/cms
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
- 127
- Primera → última
- 07.2021 08.2026
- Sin corrección
- 6
- Explotada en ataques
- 4
Distribución por gravedad
- Crítica 9
- Alta 41
- Media 65
- Baja 12
Divulgaciones por año
- 2021: 3
- 2022: 22
- 2023: 13
- 2024: 9
- 2025: 6
- 2026: 74
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Craft CMS Vulnerable to Stored XSS via User Group Name in User Permissions Page esta entrada
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