CVE-2025-31621
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the byBrick Accordion WordPress plugin allows attackers to inject malicious scripts into web pages. When exploited, these scripts execute in victims' browsers when they view affected pages. All WordPress sites using vulnerable versions of this plugin are affected.
💻 Affected Systems
- byBrick Accordion 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.
Likely Case
Attackers inject malicious JavaScript to steal user session cookies or credentials, potentially compromising user accounts.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before reaching users' browsers.
🎯 Exploit Status
Stored XSS vulnerabilities are commonly exploited and weaponization is likely given the prevalence of WordPress.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.1 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'byBrick Accordion'. 4. Click 'Update Now' if update available. 5. If no update, deactivate and delete plugin, then install fresh version from WordPress repository.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily disable the vulnerable plugin until patched version is available
wp plugin deactivate bybrick-accordion
Content Security Policy
allImplement strict Content Security Policy headers to mitigate XSS impact
Add 'Content-Security-Policy: default-src 'self'; script-src 'self'' to web server configuration
🧯 If You Can't Patch
- Remove the byBrick Accordion plugin completely from your WordPress installation
- Implement web application firewall (WAF) rules to block XSS payloads targeting this plugin
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for byBrick Accordion version 1.0 or earlierCheck Version:
wp plugin get bybrick-accordion --field=versionVerify Fix Applied:
Verify plugin version is 1.0.1 or later in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to WordPress admin-ajax.php with script tags
- Multiple failed login attempts following plugin updates
Network Indicators:
- HTTP requests containing malicious script payloads in parameters
- Unexpected outbound connections from WordPress server
SIEM Query:
source="wordpress.log" AND ("bybrick-accordion" OR "admin-ajax.php") AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")