CVE-2026-63490
HighCVSS 7.5Exploitation Probability (EPSS)
Elevated risk52th percentile - higher than 52% of all known CVEs
Summary
Handlebars.java before version 4.5.3 contains a file read vulnerability. SpringTemplateLoader does not properly validate view names, allowing a remote attacker to read files accessible to the JVM when an application exposes a controller with a user-influenced view name. Fixed in version 4.5.3.
Risk Assessment
An attacker can read sensitive files from the server, such as configurations, credentials, or user data, leading to information disclosure.
Recommendation
Update Handlebars.java to version 4.5.3 or later, which includes the fix.
Other vulnerabilities in Handlebars.java
See all- CVE-2026-103088High
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, reading files outside the configured template base directory.
- CVE-2026-55760High
A path traversal vulnerability in Handlebars.java allows arbitrary file read. Applications passing user-controlled input to Handlebars.compile() with FileTemplateLoader or ClassPathTemplateLoader are affected.
Original NVD description (English source)
Handlebars.java provides logic-less and semantic Mustache templates with Java. Prior to 4.5.3, com.github.jknack.handlebars.springmvc.SpringTemplateLoader resolves attacker-influenced Spring MVC view names through Spring ResourceLoader without the path-containment validation used by other URL-based loaders. In handlebars-springmvc/src/main/java/com/github/jknack/handlebars/springmvc/SpringTemplateLoader.java, a view name using a file: or classpath: URL and ending with the # fragment delimiter places the appended .hbs suffix in the fragment, which FileUrlResource.exists() and URL.openStream() discard. HandlebarsViewResolver in handlebars-springmvc/src/main/java/com/github/jknack/handlebars/springmvc/HandlebarsViewResolver.java then passes the attacker-controlled name to handlebars.compile(), allowing an unauthenticated remote attacker to read files accessible to the JVM when an application exposes a controller with a user-influenced view name. This issue is fixed in version 4.5.3.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS