Summary
HTML Injection in preact
Versions of preact 10.x on prerelease tags alpha and beta prior to 10.0.0-beta.1 are vulnerable to HTML Injection. Due to insufficient input validation the package allows attackers to inject JavaScript objects as virtual-dom nodes, which may lead to Cross-Site Scripting. This requires user input parsed with JSON.parse() to be passed directly into JSX without sanitization.
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.
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Upgrade to version 10.0.0-beta.1.
Frequently Asked Questions
- What is GHSA-CG48-9HH2-X6MX? GHSA-CG48-9HH2-X6MX is a medium-severity security vulnerability in preact (npm), affecting versions >= 10.0.0-alpha.0, <= 10.0.0-beta.0. It is fixed in 10.0.0-beta.1.
- Which versions of preact are affected by GHSA-CG48-9HH2-X6MX? preact (npm) versions >= 10.0.0-alpha.0, <= 10.0.0-beta.0 is affected.
- Is there a fix for GHSA-CG48-9HH2-X6MX? Yes. GHSA-CG48-9HH2-X6MX is fixed in 10.0.0-beta.1. Upgrade to this version or later.
- Is GHSA-CG48-9HH2-X6MX exploitable, and should I be worried? Whether GHSA-CG48-9HH2-X6MX 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-CG48-9HH2-X6MX 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-CG48-9HH2-X6MX? Upgrade
preactto 10.0.0-beta.1 or later.