CVE-2025-1703
📋 TL;DR
The Ultimate Blocks WordPress plugin has a stored XSS vulnerability that allows authenticated attackers with Contributor access or higher to inject malicious scripts into website pages. These scripts execute whenever users view the compromised pages, potentially compromising visitor accounts or stealing sensitive data. All WordPress sites using Ultimate Blocks version 3.2.7 or earlier are affected.
💻 Affected Systems
- Ultimate Blocks 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, take over the WordPress site, deface pages, redirect visitors to malicious sites, or install backdoors for persistent access.
Likely Case
Attackers with contributor accounts inject malicious scripts to steal visitor session cookies, credentials, or personal information, potentially compromising user accounts on the site.
If Mitigated
With proper user access controls and content security policies, the impact is limited to potential defacement of specific pages where scripts were injected.
🎯 Exploit Status
Exploitation requires authenticated access but is technically simple once an attacker has Contributor privileges. The vulnerability is well-documented in public sources.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.2.8 or later
Vendor Advisory: https://wordpress.org/plugins/ultimate-blocks/#developers
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find Ultimate Blocks and click 'Update Now'. 4. Verify version is 3.2.8 or higher.
🔧 Temporary Workarounds
Disable Ultimate Blocks Plugin
allTemporarily disable the vulnerable plugin until patched
wp plugin deactivate ultimate-blocks
Restrict User Roles
allLimit Contributor and higher role assignments to trusted users only
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Enable WordPress security plugins with XSS protection features
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Ultimate Blocks → Version. If version is 3.2.7 or lower, you are vulnerable.Check Version:
wp plugin get ultimate-blocks --field=versionVerify Fix Applied:
After updating, verify Ultimate Blocks version shows 3.2.8 or higher in WordPress admin plugins page.📡 Detection & Monitoring
Log Indicators:
- Unusual content modifications by Contributor users
- Suspicious script tags in page content
- Multiple failed login attempts followed by successful Contributor login
Network Indicators:
- Unexpected external script loads from WordPress pages
- Suspicious outbound connections from visitor browsers after page load
SIEM Query:
source="wordpress" AND (event="plugin_update" AND plugin="ultimate-blocks" AND version<="3.2.7") OR (event="content_edit" AND user_role="contributor" AND content CONTAINS "<script>")🔗 References
- https://plugins.trac.wordpress.org/browser/ultimate-blocks/trunk/src/extensions/responsive-control/class-responsive-control.php#L46
- https://plugins.trac.wordpress.org/changeset/3260377
- https://plugins.trac.wordpress.org/changeset/3260377/ultimate-blocks/trunk/src/extensions/responsive-control/class-responsive-control.php
- https://wordpress.org/plugins/ultimate-blocks/#developers
- https://www.wordfence.com/threat-intel/vulnerabilities/id/a2520d98-3cee-4431-bf9c-b2fd01a584ce?source=cve
