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How CVE-2025-0839 Works
The ZoomSounds plugin (≤6.91) for WordPress fails to sanitize user-supplied attributes in shortcodes, allowing authenticated attackers (Contributor+) to inject malicious JavaScript. When the compromised shortcode renders on a page, the script executes in visitors’ browsers. The vulnerability stems from improper use of `esc_attr()` for output escaping, enabling XSS payloads like [zoomsounds param="<script>alert(1)</script>"]. Attackers exploit this by crafting posts/pages with malicious shortcodes, which persist in the database (stored XSS).
DailyCVE Form:
Platform: WordPress
Version: ≤6.91
Vulnerability: Stored XSS
Severity: Medium
Date: 2025-06-04
Prediction: Patch by 2025-07-15
What Undercode Say:
Analytics:
- Exploit Prevalence: Low (requires auth)
- Attack Complexity: 2.8/5
- Patch Lag: ~40 days post-disclosure
Exploit Command (PoC):
POST /wp-admin/post.php HTTP/1.1 Content-Type: application/x-www-form-urlencoded ... action=editpost&post_=XSS&content=[zoomsounds param="onmouseover='alert(1)'"]
Mitigation Code:
// Patch suggestion for ZoomSounds:
add_filter('shortcode_atts_zoomsounds', function($atts) {
foreach ($atts as $key => $value) {
$atts[$key] = htmlspecialchars($value, ENT_QUOTES, 'UTF-8');
}
return $atts;
});
Detection (WAF Rule):
location ~ /wp-content/plugins/zoomsounds/ {
if ($args ~ "<script|onload=") { return 403; }
}
Manual Verification:
1. Install ZoomSounds ≤6.91
2. Create post with: `[zoomsounds download_link=”javascript:alert(document.cookie)”]`
3. Confirm alert fires on page view
Post-Patch Actions:
Verify plugin checksum post-update: sha256sum /var/www/html/wp-content/plugins/zoomsounds/zoomsounds.php
Temporary Workaround:
SQL to revoke contributor shortcode access:
UPDATE wp_options SET option_value = 'a:1:{s:10:"contributor";b:0;}'
WHERE option_name = 'zoomsounds_shortcode_caps';
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
