CVE-2026-40477CRITICAL 9.0EPSS p46.2%
CVE-2026-40477CVE-2026-40477
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 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.
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 | 0.65% probability of exploitation · percentile 46.2% · 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.