Improper neutralization of specific syntax patterns for unauthorized expressions in Thymeleaf
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 neutralize specific syntax patterns that allow for the execution of unauthorized expressions. 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 Dawid Bakaj (VIPentest.com) 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-xjw8-8c5c-9r79 - 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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Improper neutralization of specific syntax patterns for unauthorized expressions in Thymeleaf esta entrada
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