CVE-2026-40477
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 expression execution mechanisms. 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). This issue has ben fixed in version 3.1.4.RELEASE.
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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-r4v4-5mwr-2fwrghsaADVISORY
- github.com/thymeleaf/thymeleaf/security/advisories/GHSA-r4v4-5mwr-2fwrnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-40477ghsaADVISORY
News mentions
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