Thymeleaf: Improper recognition of unauthorized syntax patterns in sandboxed Thymeleaf expressions

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Summary

CVECVE-2026-41901
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-12 23:16:17 UTC
Updated2026-05-12 23:16:17 UTC
DescriptionThymeleaf 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.

Risk And Classification

Primary CVSS: v3.1 9 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Problem Types: CWE-917 | CWE-1336 | CWE-917 CWE-917: Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection') | CWE-1336 CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9CRITICALCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED9CRITICALCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Thymeleaf Thymeleaf affected < 3.1.5.RELEASE Not specified

References

ReferenceSourceLinkTags
github.com/thymeleaf/thymeleaf/security/advisories/GHSA-c9ph-gxww-7744 [email protected] github.com
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