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The CVE-2024-3273 vulnerability exploits a Cross-Site Scripting (XSS) flaw in the ErrorBoundary component of the hono/jsx library. Specifically, the component in src/jsx/components.ts previously forced certain rendering paths to output raw HTML, bypassing the library’s default escaping behavior. This occurs when developers pass untrusted user-controlled strings directly as children to ErrorBoundary or when the fallbackRender function returns such strings, like error messages containing attacker input. The component treats these strings as raw HTML without sanitization, allowing arbitrary JavaScript to be embedded. When a victim’s browser renders this output, the script executes in the context of the application. This reflected XSS attack is only exploitable if applications use ErrorBoundary with unescaped user input, typically via crafted payloads in user-submitted data that get reflected in error responses or fallback UI.
Platform: hono/jsx
Version: versions before 1.0.0
Vulnerability: Cross-Site Scripting
Severity: Critical
Date: 2024-04-15
Prediction: Patched 2024-04-20
What Undercode Say:
Analytics:
bash commands:
`npm list hono/jsx`
`npm update hono/jsx`
codes:
<ErrorBoundary fallbackRender={(e) => e.message}>
{userInput}
</ErrorBoundary>
How Exploit:
Inject script tags via user input rendered by ErrorBoundary.
Protection from this CVE:
Update to patched version. Sanitize user input.
Impact:
Arbitrary JavaScript execution, session compromise.
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Sources:
Reported By: github.com
Extra Source Hub:
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