CVE-2025-30553
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the GMO Font Agent WordPress plugin allows attackers to inject malicious scripts into web pages. When exploited, these scripts execute in victims' browsers, potentially stealing session cookies or performing actions on their behalf. All WordPress sites using vulnerable versions of the GMO Font Agent plugin are affected.
💻 Affected Systems
- GMO Font Agent 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, potentially leading to complete site compromise and data theft.
Likely Case
Attackers inject malicious JavaScript that steals user session cookies or credentials, enabling account takeover and unauthorized access to the WordPress dashboard.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before reaching users' browsers, preventing execution.
🎯 Exploit Status
Stored XSS vulnerabilities in WordPress plugins are frequently weaponized. While no public PoC is confirmed, exploitation requires authenticated access to inject payloads.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.7 or later
Restart Required: No
Instructions:
1. Log into WordPress admin dashboard. 2. Navigate to Plugins > Installed Plugins. 3. Find 'GMO Font Agent' and check for updates. 4. If update is available, click 'Update Now'. 5. Alternatively, download version 1.7+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily disable the vulnerable plugin until patched
wp plugin deactivate gmo-font-agent
Implement WAF Rules
allAdd web application firewall rules to block XSS payloads targeting the plugin
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Restrict plugin access to trusted users only and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin dashboard > Plugins > Installed Plugins for GMO Font Agent version 1.6 or earlierCheck Version:
wp plugin get gmo-font-agent --field=versionVerify Fix Applied:
Verify plugin version is 1.7 or later in WordPress plugins list📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to plugin endpoints
- JavaScript payloads in request parameters
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Outbound connections to suspicious domains from WordPress server
- Unusual traffic patterns to plugin-specific URLs
SIEM Query:
source="wordpress.log" AND ("gmo-font-agent" OR "font-agent") AND ("script" OR "javascript" OR "onerror" OR "onload")