CVE-2025-57941
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the WordPress Append Link on Copy plugin allows attackers to inject malicious scripts that execute when users view affected pages. The vulnerability affects all WordPress sites using vulnerable versions of this plugin, potentially compromising user sessions and site integrity.
💻 Affected Systems
- WordPress Append Link on Copy 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, deface websites, redirect users to malicious sites, or install backdoors for persistent access.
Likely Case
Attackers inject malicious scripts to steal user session cookies, perform actions on behalf of users, or display phishing content.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before execution, preventing exploitation.
🎯 Exploit Status
Exploitation requires the ability to inject malicious input that gets stored and displayed to other users.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 0.2
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Append Link on Copy' and update to latest version. 4. If no update available, disable and remove the plugin.
🔧 Temporary Workarounds
Disable vulnerable plugin
WordPressTemporarily disable the Append Link on Copy plugin until patched version is available
wp plugin deactivate append-link-on-copy
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block XSS payloads
- Enable Content Security Policy (CSP) headers to restrict script execution
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Append Link on Copy → Version. If version is 0.2 or earlier, you are vulnerable.Check Version:
wp plugin get append-link-on-copy --field=versionVerify Fix Applied:
Verify plugin version is higher than 0.2 and test input fields for proper HTML encoding.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests containing script tags or JavaScript payloads to plugin endpoints
- Multiple failed XSS attempts in web server logs
Network Indicators:
- HTTP requests with suspicious parameters containing script tags or JavaScript code
SIEM Query:
source="web_server" AND ("script" OR "javascript" OR "onclick" OR "onload") AND uri="*/wp-content/plugins/append-link-on-copy/*"