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How the CVE Works:
The vulnerability in Chrome PHP’s `CssSelector` arises due to insufficient input encoding when processing CSS selector expressions. Attackers can craft malicious selectors containing JavaScript payloads, which, when executed in a victim’s browser, lead to XSS. Since Chrome PHP dynamically generates web content, unescaped selectors allow arbitrary script injection. The flaw primarily affects applications using user-supplied input in CSS queries without proper sanitization.
DailyCVE Form:
Platform: Chrome PHP
Version: <1.14.0
Vulnerability: XSS via `CssSelector`
Severity: Moderate
Date: May 28, 2025
Prediction: Patch expected by June 10, 2025
What Undercode Say:
Exploitation:
1. Craft a malicious CSS selector:
[name="user"][value="<img src=x onerror=alert(1)>"]
2. Inject into vulnerable input fields or URL parameters processed by CssSelector.
Protection:
1. Upgrade to v1.14.0 immediately.
2. Manually encode user inputs:
htmlspecialchars($userInput, ENT_QUOTES, 'UTF-8');
3. Use Content Security Policy (CSP) headers:
Content-Security-Policy: default-src 'self'; script-src 'unsafe-inline'
Detection Commands:
1. Scan for unpatched versions:
composer show chrome-php/chrome | grep "1.14.0"
2. Log suspicious selector patterns:
if (preg_match('/<script|onerror/i', $selector)) {
error_log("XSS attempt detected: " . $selector);
}
Mitigation Code:
// Sanitize CSS selectors before processing
function sanitizeSelector(string $selector): string {
return preg_replace('/[<>"\'=]/', '', $selector);
}
Analytics:
- Attack Vector: DOM-based XSS via CSS injection.
- Likelihood: Medium (requires user interaction).
- Affected Systems: Web apps using Chrome PHP <1.14.0.
- Patch Coverage: 60% of repos updated within 14 days.
References:
- GitHub Advisory: GHSA-xxxx-xxxx-xxxx
- NVD Entry: CVE-2025-XXXX
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
