CVE-2026-40477
Thymeleaf is a server-side Java template engine for web and standalone environments.
Published Apr 17, 2026 · updated Aug 4, 2026 · thymeleaf thymeleaf
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.
Code
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Timeline
Detection, updates, and resolution for this record.
Apr 17, 2026 · NIST NVD
Detected
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 fro
Aug 4, 2026 · NIST NVD
Updated
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 fro
Affected
- cpe thymeleaf/thymeleafversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-40477
Official CVE identifier
cve.org - NIST NVDVulnerability recordCVE-2026-40477
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
nvd.nist.gov