CVE-2025-30573
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the WordPress 'My Default Post Content' plugin allows attackers to inject malicious scripts into posts that execute when viewed by other users. It affects all WordPress sites using this plugin from any version up to 0.7.3. The vulnerability requires contributor-level access or higher to exploit.
💻 Affected Systems
- WordPress My Default Post Content 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
An attacker with contributor access could inject malicious JavaScript that steals administrator session cookies, leading to full site compromise and potential data exfiltration.
Likely Case
Malicious scripts could redirect users to phishing sites, display unwanted content, or perform actions on behalf of authenticated users.
If Mitigated
With proper input validation and output encoding, the malicious scripts would be rendered harmless as text rather than executable code.
🎯 Exploit Status
Exploitation requires authenticated access with at least contributor privileges. The vulnerability is publicly documented with technical details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.7.4 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'My Default Post Content' and click 'Update Now' if available. 4. If no update is available, deactivate and delete the plugin, then install the latest version from WordPress repository.
🔧 Temporary Workarounds
Disable vulnerable plugin
allTemporarily deactivate the plugin until patched version is available
wp plugin deactivate my-default-post-content
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 panel → Plugins → Installed Plugins for 'My Default Post Content' version. If version is 0.7.3 or earlier, you are vulnerable.Check Version:
wp plugin get my-default-post-content --field=versionVerify Fix Applied:
After updating, verify plugin version shows 0.7.4 or later in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual post content containing script tags or JavaScript code
- Multiple post edits by the same user in short time
Network Indicators:
- Outbound connections to suspicious domains from WordPress site
- Unusual traffic patterns to post viewing pages
SIEM Query:
source="wordpress.log" AND ("script" OR "javascript" OR "onclick" OR "onload") AND "post_content"