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CVE

CVE-2026-41901

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

CVE-2026-41901

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

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9
-
3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
C
H
U
9
-
3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41901.json, https://github.com/thymeleaf/thymeleaf/security/advisories/GHSA-c9ph-gxww-7744, https://nvd.nist.gov/vuln/detail/CVE-2026-41901

Severity

9

CVSS Score
0
10

Basic Information

Base CVSS
9
EPSS Probability
0.00427%
EPSS Percentile
0.36371%
Introduced Version
0
Fix Available
10f9dd2eb8cbd98515ce14b149d115e0287d0add

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