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How the CVE Works
The vulnerability exists in the Craft CMS Freeform plugin’s Control Panel (CP) React.js components. An attacker with low-privilege access to edit forms or integrations can inject malicious HTML or JavaScript into user-controlled fields, such as form labels and integration icon SVG metadata. The plugin’s frontend code then directly injects this unsanitized user input into the DOM using React’s `dangerouslySetInnerHTML` property. This occurs in key CP views like the form builder and integrations manager. Consequently, when an administrator later views a compromised form or the integrations list, the injected payload is rendered and executed in the admin’s browser context, leading to stored Cross-Site Scripting.
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Platform: Craft CMS Plugin
Version: <= 5.14.6
Vulnerability: Stored XSS
Severity: Critical
date: 2024-10-10
Prediction: Patch within 7 days.
What Undercode Say
Analytics
grep -r "dangerouslySetInnerHTML" packages/plugin/src/Resources/js/
find . -name ".js" -type f -exec grep -l "user-controlled" {} \;
// Example of vulnerable code pattern
<div dangerouslySetInnerHTML={{ __html: userProvidedLabel }} />
How Exploit
1. Attacker logs in with form-editor permissions.
2. Creates a new form field.
3. Sets field label to `
`.
4. Saves the form.
5. Admin views form builder.
6. Payload executes in admin session.
Protection from this CVE
1. Sanitize all user inputs.
2. Avoid `dangerouslySetInnerHTML` for dynamic content.
3. Implement strict Content Security Policy.
4. Apply HTML encoding before rendering.
Impact
Admin session hijacking.
CSRF token theft.
Full administrative takeover.
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Sources:
Reported By: github.com
Extra Source Hub:
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