CVE-2026-40478
Description
Thymeleaf is a server-side Java template engine for web and standalone environments. Versions 3.1.3.RELEASE and prior contain a security bypass vulnerability in the the expression execution mechanisms. 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). This issue has ben fixed in version 3.1.4.RELEASE.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
org.thymeleaf:thymeleafMaven | < 3.1.4.RELEASE | 3.1.4.RELEASE |
org.thymeleaf:thymeleaf-spring5Maven | < 3.1.4.RELEASE | 3.1.4.RELEASE |
org.thymeleaf:thymeleaf-spring6Maven | < 3.1.4.RELEASE | 3.1.4.RELEASE |
Affected products
4- ghsa-coords3 versionspkg:maven/org.thymeleaf/thymeleafpkg:maven/org.thymeleaf/thymeleaf-spring5pkg:maven/org.thymeleaf/thymeleaf-spring6
< 3.1.4.RELEASE+ 2 more
- (no CPE)range: < 3.1.4.RELEASE
- (no CPE)range: < 3.1.4.RELEASE
- (no CPE)range: < 3.1.4.RELEASE
Patches
Vulnerability mechanics
References
3- github.com/advisories/GHSA-xjw8-8c5c-9r79ghsaADVISORY
- github.com/thymeleaf/thymeleaf/security/advisories/GHSA-xjw8-8c5c-9r79nvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-40478ghsaADVISORY
News mentions
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