CVE-2025-11162
📋 TL;DR
This vulnerability allows authenticated WordPress users with Contributor-level access or higher to inject malicious JavaScript code into website pages through the Spectra Gutenberg Blocks plugin's Custom CSS feature. The injected scripts execute whenever visitors view the compromised pages, enabling attackers to steal session cookies, redirect users, or deface websites. All WordPress sites using Spectra Gutenberg Blocks plugin versions up to 2.19.14 are affected.
💻 Affected Systems
- Spectra Gutenberg Blocks – Website Builder for the Block Editor (WordPress plugin)
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, gain full site control, install backdoors, redirect all visitors to malicious sites, or deploy ransomware notices.
Likely Case
Attackers inject malicious scripts to steal user session cookies, redirect visitors to phishing pages, or display unwanted advertisements.
If Mitigated
With proper user role management and input validation, impact is limited to defacement or minor content manipulation.
🎯 Exploit Status
Exploitation requires authenticated access but is trivial once authenticated. The vulnerability details and code locations are publicly documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.19.15 or later
Vendor Advisory: https://wordpress.org/plugins/ultimate-addons-for-gutenberg/#developers
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Spectra' plugin. 4. Click 'Update Now' if update is available. 5. Alternatively, download latest version from WordPress.org and manually update.
🔧 Temporary Workarounds
Disable Custom CSS feature
allTemporarily disable the vulnerable Custom CSS functionality in Spectra plugin
Add to wp-config.php: define('UAGB_DISABLE_CUSTOM_CSS', true);
Restrict user roles
allRemove Contributor role access or limit who can edit posts/pages
Use WordPress role management plugins or custom code to restrict capabilities
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Install web application firewall (WAF) with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Spectra → Version. If version is 2.19.14 or lower, you are vulnerable.Check Version:
wp plugin get ultimate-addons-for-gutenberg --field=version (if WP-CLI installed)Verify Fix Applied:
After updating, verify version is 2.19.15 or higher. Test Custom CSS field with script tags to ensure they are properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual post/page edits by Contributor users
- Multiple failed login attempts followed by successful Contributor login
- POST requests to wp-admin with script tags in Custom CSS parameters
Network Indicators:
- Outbound connections to suspicious domains from your WordPress site
- Unexpected JavaScript includes in page responses
SIEM Query:
source="wordpress" AND ("Custom CSS" OR "uagb" OR "spectra") AND ("script" OR "javascript:" OR "onload=" OR "onerror=")🔗 References
- https://plugins.trac.wordpress.org/browser/ultimate-addons-for-gutenberg/tags/2.19.14/classes/class-uagb-loader.php#L522
- https://plugins.trac.wordpress.org/browser/ultimate-addons-for-gutenberg/tags/2.19.14/classes/class-uagb-post-assets.php#L1418
- https://www.wordfence.com/threat-intel/vulnerabilities/id/2f077817-704f-4595-bfb1-80234dd23f8d?source=cve
