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Vulnerabilities CVE-2026-40477

CVE-2026-40477

Critical
Open
TLP:CLEAR

Improper restriction of the scope of accessible objects in Thymeleaf expressions

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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 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.

Details

CVSS Score
9.1
EPSS Score
0.85%

54.9th 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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