CVE-2026-41901— Thymeleaf: Improper recognition of unauthorized syntax patterns in sandboxed Thymeleaf expressions
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I. Basic Information for CVE-2026-41901
Vulnerability Information
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Vulnerability Title
Thymeleaf: Improper recognition of unauthorized syntax patterns in sandboxed Thymeleaf expressions
Source: NVD (National Vulnerability Database)
Vulnerability Description
Thymeleaf is a server-side Java template engine for web and standalone environments. Prior to 3.1.5.RELEASE, a security bypass vulnerability exists in the expression execution mechanisms of Thymeleaf. Although the library provides mechanisms to avoid the execution of potentially dangerous expressions in some specific sandboxed (restricted) contexts, it fails to properly neutralize specific constructs that allow this kind of expressions to be executed. If an application developer passes to the template engine unsanitized variables that contain such expressions, and these values are used in sandboxed contexts inside the templates, these expressions can be executed achieving Server-Side Template Injection (SSTI). This vulnerability is fixed in 3.1.5.RELEASE.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
表达式语言语句中使用的特殊元素转义处理不恰当(表达式语言注入)
Source: NVD (National Vulnerability Database)
Vulnerability Title
thymeleaf 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
thymeleaf是Thymeleaf开源的一个Java模板引擎。 thymeleaf 3.1.5.RELEASE之前版本存在安全漏洞，该漏洞源于表达式执行机制存在安全绕过，可能导致服务器端模板注入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-41901
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IV. Related Vulnerabilities
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