CVE-2026-40478CRITICAL 9.0EPSS p43.3%
CVE-2026-40478CVE-2026-40478
Description
Thymeleaf 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 the expression execution mechanisms. Although the library provides mechanisms to prevent expression injection, it fails to properly neutralize specific syntax patterns that allow for the execution of unauthorized expressions. 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.
Scoring
| CVSS 3.1 | 9.0 (CRITICAL) |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |
| EPSS | 0.58% probability of exploitation · percentile 43.3% · 2026-06-19T12:03:05Z |
| Published | 2026-04-17 |
| Last modified | 2026-04-24 |
Underlying weaknesses· 2
References
2
| Type | Target | Confidence | Tier |
|---|---|---|---|
| Weakness | Improper Neutralization of Special Elements Used in a Template Enginecwe-1336 | 0% | live |
| Weakness | Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')cwe-917 | 0% | live |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.