Sandboxed Thymeleaf expressions vulnerable to improper recognition of unauthorized syntax patterns
Impact
A security bypass vulnerability exists in the expression execution mechanisms of Thymeleaf up to and including 3.1.4.RELEASE. Although the library provides mechanisms to avoid the execution of potentially dangerous expressions in some specific sandboxed (restricted) contexts, it fails to properly neutralize specific constructs that allow this kind of expressions to be executed. If an application developer passes to the template engine unsanitized variables that contain such expressions, and these values are used in sandboxed contexts inside the templates, these expressions can be executed achieving Server-Side Template Injection (SSTI).
Patches
This has been fixed in Thymeleaf 3.1.5.RELEASE. All users are advised to upgrade immediately.
Workarounds
No workaround is available beyond ensuring applications do not pass unvalidated/unsanitized data directly to the template engine. Upgrading to 3.1.5.RELEASE is strongly recommended in any case.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Java / Kotlin (Maven) | org.thymeleaf:thymeleaf | < 3.1.5.RELEASE | 3.1.5.RELEASE |
| Java / Kotlin (Maven) | org.thymeleaf:thymeleaf-spring5 | < 3.1.5.RELEASE | 3.1.5.RELEASE |
| Java / Kotlin (Maven) | org.thymeleaf:thymeleaf-spring6 | < 3.1.5.RELEASE | 3.1.5.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
- 04.05.2026
- Actualizado
- 11.10.2026 12:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-c9ph-gxww-7744 - CC BY 4.0
Historial de vulnerabilidades: org.thymeleaf:thymeleaf-spring5
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
- 4
- Primera → última
- 11.2021 05.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 4
Divulgaciones por año
- 2021: 1
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 3
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Sandboxed Thymeleaf expressions vulnerable to improper recognition of unauthorized syntax patterns esta entrada
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