Improper restriction of the scope of accessible objects in Thymeleaf expressions

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Summary

CVECVE-2026-40477
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-17 22:16:33 UTC
Updated2026-04-17 22:16:33 UTC
DescriptionThymeleaf 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.

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
3.1CNADECLARED9.1CRITICALCVSS: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 < 3.1.4.RELEASE Not specified
CNA Thymeleaf Org.thymeleafthymeleaf-spring5 affected < 3.1.4.RELEASE Not specified
CNA Thymeleaf Org.thymeleafthymeleaf-spring6 affected < 3.1.4.RELEASE Not specified

References

ReferenceSourceLinkTags
github.com/thymeleaf/thymeleaf/security/advisories/GHSA-r4v4-5mwr-2fwr [email protected] github.com
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