Code Injection in handlebars.js - CVE-2026-33941

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Main Vulnerability Database Vulnerabilities #VU124843

Code Injection in handlebars.js - CVE-2026-33941

Published: April 2, 2026


Vulnerability identifier: #VU124843
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-33941
CWE-ID: CWE-94
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to execute arbitrary JavaScript code.

The vulnerability exists due to improper neutralization of user-controlled input in the Handlebars CLI precompiler when generating JavaScript output from template file names and CLI options. A local user can supply specially crafted template names or option values to execute arbitrary JavaScript code.

The issue affects bin/handlebars and lib/precompiler.js through multiple injection points involving template names, namespace values, CommonJS paths, and AMD paths, and the injected code executes when the generated bundle is loaded in Node.js or a browser. User interaction is required to load the generated bundle.


Affected software

handlebars.js
Storage Defender Copy Data Management
Fedora
IBM App Connect Enterprise
nextcloud

How to mitigate CVE-2026-33941

Install security update from vendor's website.

handlebars.js - update to 4.7.9
Storage Defender Copy Data Management - update to 2.3.1.0
IBM App Connect Enterprise - addressed in versions 12.0.12.25, 13.0.7.1
nextcloud - addressed in versions 33.0.3-1.el10_2, 33.0.3-1.el10_3, 33.0.3-1.fc42, 33.0.3-1.fc43, 33.0.3-1.fc44

External References

Related Security Bulletins