CVE-2025-30540
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the AvaiBook WordPress plugin allows attackers to inject malicious scripts into web pages. When users view affected pages, the scripts execute in their browsers, potentially stealing credentials or performing unauthorized actions. All WordPress sites using AvaiBook versions up to 1.2 are affected.
💻 Affected Systems
- AvaiBook 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 WordPress sites, deface websites, or redirect visitors to malicious sites.
Likely Case
Attackers steal user session cookies or credentials, perform actions as authenticated users, or display malicious content to visitors.
If Mitigated
With proper input validation and output encoding, malicious scripts are neutralized before reaching users' browsers.
🎯 Exploit Status
Stored XSS vulnerabilities are commonly exploited. While no public PoC is confirmed, the vulnerability type is well-understood and easily weaponized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 1.2
Vendor Advisory: https://patchstack.com/database/wordpress/plugin/avaibook/vulnerability/wordpress-avaibook-plugin-1-2-cross-site-scripting-xss-vulnerability?_s_id=cve
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find AvaiBook plugin. 4. Click 'Update Now' if update available. 5. If no update available, deactivate and remove plugin immediately.
🔧 Temporary Workarounds
Disable AvaiBook Plugin
allTemporarily disable the vulnerable plugin until patched version is available
wp plugin deactivate avaibook
Implement WAF Rules
allConfigure web application firewall to block XSS payloads targeting AvaiBook endpoints
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Deploy web application firewall with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for AvaiBook version 1.2 or earlierCheck Version:
wp plugin list --name=avaibook --field=versionVerify Fix Applied:
Verify AvaiBook plugin version is greater than 1.2 in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to AvaiBook endpoints with script tags
- Multiple failed login attempts after visiting AvaiBook pages
Network Indicators:
- HTTP requests containing <script> tags to AvaiBook endpoints
- Outbound connections to suspicious domains from users who visited AvaiBook pages
SIEM Query:
source="wordpress.log" AND ("avaibook" AND ("<script>" OR "javascript:" OR "onerror=" OR "onload="))