AIKIDO-2026-10651
thymeleaf is vulnerable to Expression Language Injection
91
Critical Risk
This Affects:
thymeleafTL;DR
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).
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
thymeleaf is vulnerable to Expression Language Injection in versions 0.0.1 - 3.1.4.RELEASE.
How to fix this
Upgrade the org.thymeleaf:thymeleaf library to the patch version.
Links
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