CVE-2025-22676
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the Upcasted AWS S3 for WordPress plugin allows attackers to inject malicious scripts into web pages. When exploited, these scripts execute in victims' browsers, potentially stealing session cookies, redirecting users, or performing actions on their behalf. All WordPress sites using vulnerable versions of this plugin are affected.
💻 Affected Systems
- AWS S3 for WordPress Plugin – Upcasted (Upcasted S3 Offload)
⚠️ 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, install backdoors, deface websites, or redirect visitors to malicious sites.
Likely Case
Attackers inject malicious JavaScript to steal user session cookies, potentially compromising user accounts and performing unauthorized actions.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before reaching users' browsers.
🎯 Exploit Status
Stored XSS vulnerabilities typically require some level of access to input fields, but once injected, the payload affects all users viewing the compromised page.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.0.4 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'AWS S3 for WordPress Plugin – Upcasted'. 4. Click 'Update Now' if update available. 5. Alternatively, download version 3.0.4+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Temporary Plugin Deactivation
allDisable the vulnerable plugin until patched
wp plugin deactivate upcasted-s3-offload
Input Validation Web Application Firewall Rule
allConfigure WAF to block XSS patterns in plugin-related requests
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Enable WordPress security plugins with XSS protection features
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins for 'AWS S3 for WordPress Plugin – Upcasted' version 3.0.3 or earlierCheck Version:
wp plugin get upcasted-s3-offload --field=versionVerify Fix Applied:
Verify plugin version is 3.0.4 or later in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to plugin endpoints
- Suspicious JavaScript in database entries related to plugin
Network Indicators:
- Unexpected script tags in HTTP responses from plugin pages
- External script loads from plugin content
SIEM Query:
source="wordpress" AND (plugin="upcasted-s3-offload" OR uri="/wp-content/plugins/upcasted-s3-offload") AND (method="POST" OR status=200) AND size>10000