Improper restriction of the scope of accessible objects in Thymeleaf expressions
Impact
A security bypass vulnerability exists in the expression execution mechanisms of Thymeleaf up to and including 3.1.3.RELEASE. Although the library provides mechanisms to prevent expression injection, it fails to properly restrict the scope of accessible objects, allowing specific potentially sensitive objects to be reached from within a template. If an application developer passes unvalidated user input directly to the template engine, an unauthenticated remote attacker can bypass the library's protections to achieve Server-Side Template Injection (SSTI).
Patches
This has been fixed in Thymeleaf 3.1.4.RELEASE.
Workarounds
No workaround is available beyond ensuring applications do not pass unvalidated user input directly to the template engine. Upgrading to 3.1.4.RELEASE is strongly recommended in any case.
Credits
Thanks to Thomas Reburn (Praetorian) for responsible disclosure.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Java / Kotlin (Maven) | org.thymeleaf:thymeleaf | < 3.1.4.RELEASE | 3.1.4.RELEASE |
| Java / Kotlin (Maven) | org.thymeleaf:thymeleaf-spring5 | < 3.1.4.RELEASE | 3.1.4.RELEASE |
| Java / Kotlin (Maven) | org.thymeleaf:thymeleaf-spring6 | < 3.1.4.RELEASE | 3.1.4.RELEASE |
Referencias
- Vector CVSS
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H- Debilidad (CWE)
CWE-1336, CWE-917- Plataforma
- Java / Kotlin (Maven)
- Paquete
org.thymeleaf:thymeleaf, org.thymeleaf:thymeleaf-spring5, org.thymeleaf:thymeleaf-spring6- Publicada
- 15.04.2026
- Actualizado
- 11.10.2026 12:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-r4v4-5mwr-2fwr - CC BY 4.0
Historial de vulnerabilidades: org.thymeleaf:thymeleaf
Todas las vulnerabilidades publicadas de este paquete (Java / Kotlin (Maven)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 3
- Primera → última
- 04.2026 05.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 3
Divulgaciones por año
- 2026: 3
-
Improper restriction of the scope of accessible objects in Thymeleaf expressions esta entrada
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