CVE-2025-9854
📋 TL;DR
This vulnerability allows authenticated WordPress users with contributor-level access or higher to inject malicious scripts into website pages using the 'asmp-switcher' shortcode. The injected scripts execute whenever users visit the compromised pages, enabling attackers to steal session cookies, redirect users, or perform other malicious actions. All WordPress sites using vulnerable versions of the A Simple Multilanguage Plugin are affected.
💻 Affected Systems
- A Simple Multilanguage Plugin for WordPress
⚠️ 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 gain administrative access to WordPress, install backdoors, steal sensitive user data, or redirect visitors to malicious sites, potentially leading to complete site compromise and data breaches.
Likely Case
Attackers inject malicious JavaScript to steal user session cookies, redirect visitors to phishing pages, or deface website content, compromising user trust and potentially leading to credential theft.
If Mitigated
With proper user access controls and content security policies, impact is limited to potential content defacement or minor user experience disruption on affected pages.
🎯 Exploit Status
Exploitation requires authenticated access but is technically simple. The vulnerability details are publicly documented with code references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.1 or later
Vendor Advisory: https://plugins.trac.wordpress.org/browser/a-simple-multilanguage/trunk/a-simple-multilang.php
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'A Simple Multilanguage Plugin'. 4. Click 'Update Now' if update is available. 5. If no update appears, manually download version 1.1+ from WordPress plugin repository and replace the plugin files.
🔧 Temporary Workarounds
Disable plugin temporarily
allTemporarily deactivate the vulnerable plugin until patched
wp plugin deactivate a-simple-multilanguage
Restrict user capabilities
allRemove contributor-level posting capabilities from untrusted users
wp user remove-role <username> contributor
wp user add-role <username> subscriber
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Review and audit all user-generated content for malicious scripts
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Installed Plugins for 'A Simple Multilanguage Plugin' version 1.0 or earlierCheck Version:
wp plugin get a-simple-multilanguage --field=versionVerify Fix Applied:
Verify plugin version is 1.1 or later in WordPress admin panel and test shortcode functionality📡 Detection & Monitoring
Log Indicators:
- Unusual shortcode usage in post/page edits
- Multiple failed login attempts followed by successful contributor-level login
Network Indicators:
- Unexpected JavaScript loading from WordPress pages
- Suspicious outbound connections from user browsers after visiting site
SIEM Query:
source="wordpress" AND (event="plugin_update" AND plugin_name="a-simple-multilanguage" AND version<1.1) OR (event="post_edit" AND user_role="contributor" AND content LIKE "%asmp-switcher%")