CVE-2026-40477
Improper restriction of the scope of accessible objects in Thymeleaf expressions
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.
| CWE | CWE-917 CWE-1336 |
| Vendor | thymeleaf |
| Product | thymeleaf |
| Published | Apr 17, 2026 |
Get instant alerts for thymeleaf thymeleaf
Be the first to know when new critical vulnerabilities affecting thymeleaf thymeleaf are published — delivered to Slack, Telegram or Discord.
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H