Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/jknack/handlebars.java/commit/61f43423a337b87db5fec1fe59f0725
- https://github.com/jknack/handlebars.java/releases/tag/v4.5.3
- https://github.com/jknack/handlebars.java/security/advisories/GHSA-g29j-rwfv-h99
FAQ
What is CVE-2026-63490?
CVE-2026-63490 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...
How severe is CVE-2026-63490?
CVE-2026-63490 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-63490?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.