Vulnerability · Published Sep 30, 2026 · Assigned by mitre
CVE-2026-103088
High 7.5
In plain English
A high-severity security flaw in handlebars.java from jknack. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).
Official description
Handlebars.java before 4.5.5 allows directory traversal. In handlebars-springmvc 4.5.3 and 4.5.4, the path-containment fix for CVE-2026-63490 validates template locations as raw percent-encoded strings, whereas the template file is opened through a URL handler that percent-decodes the path. In a Spring MVC application with a file: template prefix and a request-derived view name, a percent-encoded traversal such as %2e%2e/ bypasses both the view-resolver check and the loader-side containment and reads files outside the configured template base directory.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| jknack | handlebars.java | 4.5.3 – before 4.5.5 |
Weakness: CWE-24 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N