CVE-2026-103088 (CVSS 7.5)

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS — Exploit Prediction

0.0069

Probability of exploitation

0.51%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-24 CWE-24

References

Other 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

Frequently Asked Questions

What is CVE-2026-103088? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-103088? +

CVE-2026-103088 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0069, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-103088? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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