CVEvulnerability

CVE-2026-40478

9.0 CRITICAL Published 2026-04-17 Modified 2026-10-26 Official page ↗
Status
Modified
Published
2026-04-17
Last modified
2026-10-26
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.0 CRITICAL — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS 3.1 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)
8.5 HIGH — CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Weaknesses
CWE-1336, CWE-917

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.

Affected configurations

• thymeleaf thymeleaf (< 3.1.4)

Related

Weakness · CWE (2)

  • CWE-1336 Improper Neutralization of Special Elements Used in a Template Engine weakness
  • CWE-917 Improper Neutralization of Special Elements used in an Expression Language Statement weakness

References