Summary
electron-builder's NSIS installer - execute arbitrary code on the target machine (Windows only)
Workarounds
None, it executes at the installer-level before the app is present on the system, so there's no way to check if it exists in a current installer.
References
https://cwe.mitre.org/data/definitions/426.html
https://cwe.mitre.org/data/definitions/427
Impact
Windows-Only: The NSIS installer makes a system call to open cmd.exe via NSExec in the .nsh installer script. NSExec by default searches the current directory of where the installer is located before searching PATH. This means that if an attacker can place a malicious executable file named cmd.exe in the same folder as the installer, the installer will run the malicious file.
CVE-2024-27303 has a CVSS score of 7.3 (High). The vector is requires local access, low privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (24.13.2); upgrading removes the vulnerable code path.
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.
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Frequently Asked Questions
- What is CVE-2024-27303? CVE-2024-27303 is a high-severity security vulnerability in app-builder-lib (npm), affecting versions < 24.13.2. It is fixed in 24.13.2.
- How severe is CVE-2024-27303? CVE-2024-27303 has a CVSS score of 7.3 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of app-builder-lib are affected by CVE-2024-27303? app-builder-lib (npm) versions < 24.13.2 is affected.
- Is there a fix for CVE-2024-27303? Yes. CVE-2024-27303 is fixed in 24.13.2. Upgrade to this version or later.
- Is CVE-2024-27303 exploitable, and should I be worried? Whether CVE-2024-27303 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 CVE-2024-27303 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 CVE-2024-27303? Upgrade
app-builder-libto 24.13.2 or later.