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CVE-2026-41901

CriticalPublished

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

Published: May 12, 2026
Updated: May 13, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 17, 2026

Primary CVSS

9.0/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 36.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-41901PoC
CVE-2026-41901

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