CVE-2025-11267
📋 TL;DR
This vulnerability allows authenticated WordPress users with Contributor-level access or higher to inject malicious JavaScript into website pages via the Custom CSS field in the VK All in One Expansion Unit plugin. The injected scripts execute whenever users visit affected pages, enabling session hijacking, defacement, or malware distribution. All WordPress sites using vulnerable plugin versions are affected.
💻 Affected Systems
- VK All in One Expansion Unit 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 credentials, install backdoors, redirect users to malicious sites, or completely compromise the WordPress site and potentially the underlying server.
Likely Case
Attackers inject malicious scripts to steal user session cookies, redirect visitors to phishing pages, or display unwanted advertisements/content.
If Mitigated
With proper input validation and output escaping, the CSS field would only accept legitimate CSS code, preventing script execution.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward once an attacker has Contributor-level credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.112.2 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'VK All in One Expansion Unit'. 4. Click 'Update Now' if available, or download version 9.112.2+ from WordPress.org. 5. Activate the updated plugin.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily deactivate the vulnerable plugin until patched
wp plugin deactivate vk-all-in-one-expansion-unit
Restrict User Roles
allRemove Contributor role access or limit who can edit CSS
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) rules to block XSS payloads in POST requests to admin-ajax.php or similar endpoints
- Monitor and audit user accounts with Contributor+ roles for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → VK All in One Expansion Unit → Version. If version is 9.112.1 or lower, you are vulnerable.Check Version:
wp plugin get vk-all-in-one-expansion-unit --field=versionVerify Fix Applied:
After updating, verify plugin version is 9.112.2 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to admin-ajax.php with '_veu_custom_css' parameter containing script tags
- Multiple failed login attempts followed by successful Contributor-level login
Network Indicators:
- Unexpected JavaScript loading from WordPress admin paths
- External script calls from CSS customization endpoints
SIEM Query:
source="wordpress.log" AND "_veu_custom_css" AND ("<script" OR "javascript:")🔗 References
- https://plugins.trac.wordpress.org/browser/vk-all-in-one-expansion-unit/tags/9.112.0.1/admin/class-veu-metabox.php#L178
- https://plugins.trac.wordpress.org/browser/vk-all-in-one-expansion-unit/tags/9.112.0.1/inc/css-customize/css-customize-single.php#L32
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3393317%40vk-all-in-one-expansion-unit%2Ftrunk&old=3385606%40vk-all-in-one-expansion-unit%2Ftrunk&sfp_email=&sfph_mail=
- https://www.wordfence.com/threat-intel/vulnerabilities/id/8996a0f0-8a49-4310-917b-62172c12afdb?source=cve
