CVE-2025-23878
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the WordPress Post-to-Post Links plugin allows attackers to inject malicious scripts into web pages. When users view pages containing the malicious content, the scripts execute in their browsers. All WordPress sites using vulnerable versions of this plugin are affected.
💻 Affected Systems
- WordPress Post-to-Post Links 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, redirect users to malicious sites, or deploy malware to visitors' browsers.
Likely Case
Attackers with contributor-level access could inject malicious scripts that execute when users view posts, potentially stealing user session data or performing actions on behalf of users.
If Mitigated
With proper input validation and output encoding, malicious scripts would be rendered harmless as plain text rather than executable code.
🎯 Exploit Status
Exploitation requires authenticated access (at least contributor role). Stored XSS vulnerabilities are commonly weaponized in WordPress environments.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.3 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Post-to-Post Links' plugin. 4. Click 'Update Now' if update is available. 5. Alternatively, download version 4.3+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable vulnerable plugin
allTemporarily disable the Post-to-Post Links plugin until patched
wp plugin deactivate easy-post-to-post-links
Restrict user roles
allLimit contributor and author roles to trusted users only
🧯 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 → Plugins → Installed Plugins for 'Post-to-Post Links' version ≤4.2Check Version:
wp plugin get easy-post-to-post-links --field=versionVerify Fix Applied:
Verify plugin version is 4.3 or higher in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual post edits by contributors/authors
- Script tags in post content containing javascript: or event handlers
Network Indicators:
- Outbound connections to suspicious domains from user browsers after visiting posts
SIEM Query:
source="wordpress.log" AND ("post modified" OR "post updated") AND user_role="contributor" OR user_role="author"