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Vulnerabilities CVE-2026-40478

CVE-2026-40478

Critical
Open
TLP:CLEAR

Improper neutralization of specific syntax patterns for unauthorized expressions in Thymeleaf

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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.

Details

CVSS Score
9.1
EPSS Score
0.77%

52.5th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Confidence
90%
Published
Apr 17, 2026
Last Modified
Aug 4, 2026
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