What’s Vulnerable › Vulnerabilities

CVE-2026-103088

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-30 · updated 2026-09-30
• Weakness: CWE-24

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

• jknack handlebars.java: from 4.5.3 before 4.5.5 — fixed in 4.5.5

How to fix

Upgrade to a fixed version: jknack handlebars.java 4.5.5. Check the vendor advisory for mitigations.

References

• https://github.com/jknack/handlebars.java/commit/f6ae3979917d05bef07f00befb4013ef00503660
• https://github.com/jknack/handlebars.java/releases/tag/v4.5.5
• https://github.com/jknack/handlebars.java/security/advisories/GHSA-pvrx-3g7m-fpgv
• https://github.com/jknack/handlebars.java/security/advisories/GHSA-pvrx-3g7m-fpgv

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