Craft CMS may expose private assets through anonymous "generate transform" calls via transform URL
Summary
An unauthenticated user can call assets/generate-transform with a private assetId, receive a valid transform URL, and fetch transformed image bytes.
The endpoint is anonymous and does not enforce per-asset authorization before returning the transform URL.
Details
Root cause:
- Anonymous endpoint accepts user-controlled asset reference.
- It creates and returns a transform URL for that asset without checking access rights.
- If the transform output is reachable, guest users can read content derived from private assets.
Who is impacted:
- Installations where private source assets can be transformed and transform URLs are reachable.
Security consequence:
- Anonymous users can obtain content derived from private assets without authentication.
Resources
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de Composer | craftcms/cms | >= 5.0.0-RC1, < 5.9.14, >= 4.0.0-RC1, < 4.17.8 | 5.9.14, 4.17.8 |
Referencias
- https://github.com/craftcms/cms/security/advisories/GHSA-5pgf-h923-m958
- https://nvd.nist.gov/vuln/detail/CVE-2026-33160
- https://github.com/craftcms/cms/commit/7290d91639e5e3a4f7e221dfbef95c9b77331860
- https://github.com/craftcms/cms
- https://github.com/craftcms/cms/releases/tag/4.17.8
- https://github.com/craftcms/cms/releases/tag/5.9.14
- Vector CVSS
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U- Debilidad (CWE)
CWE-639, CWE-862- Plataforma
- Composer
- Paquete
craftcms/cms- Publicada
- 24.03.2026
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-5pgf-h923-m958 - 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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