Summary
Versions of handlebars prior to 3.0.8 or 4.5.3 are vulnerable to Arbitrary Code Execution. The package's lookup helper fails to properly validate templates, allowing attackers to submit templates that execute arbitrary JavaScript in the system. It is due to an incomplete fix for a previous issue. This vulnerability can be used to run arbitrary code in a server processing Handlebars templates or on a victim's browser (effectively serving as Cross-Site Scripting).
Impact
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
Upgrade to version 3.0.8, 4.5.3 or later.
Frequently Asked Questions
- What is GHSA-Q2C6-C6PM-G3GH? GHSA-Q2C6-C6PM-G3GH is a high-severity security vulnerability in handlebars (npm), affecting versions < 3.0.8. It is fixed in 3.0.8, 4.5.3.
- Which versions of handlebars are affected by GHSA-Q2C6-C6PM-G3GH? handlebars (npm) versions < 3.0.8 is affected.
- Is there a fix for GHSA-Q2C6-C6PM-G3GH? Yes. GHSA-Q2C6-C6PM-G3GH is fixed in 3.0.8, 4.5.3. Upgrade to this version or later.
- Is GHSA-Q2C6-C6PM-G3GH exploitable, and should I be worried? Whether GHSA-Q2C6-C6PM-G3GH is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether GHSA-Q2C6-C6PM-G3GH is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix GHSA-Q2C6-C6PM-G3GH?
- Upgrade
handlebarsto 3.0.8 or later - Upgrade
handlebarsto 4.5.3 or later
- Upgrade