CVE-2026-1042
📋 TL;DR
The WP Hello Bar WordPress plugin has a stored XSS vulnerability in all versions up to 1.02. Authenticated attackers with administrator privileges can inject malicious scripts that execute when users view compromised pages. This affects WordPress sites using vulnerable versions of the plugin.
💻 Affected Systems
- WP Hello Bar 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
Administrator accounts could be compromised, leading to site takeover, data theft, or malware distribution to visitors.
Likely Case
Attackers with admin access could deface websites, steal session cookies, or redirect users to malicious sites.
If Mitigated
With proper access controls and input validation, impact is limited to authenticated administrators who already have significant privileges.
🎯 Exploit Status
Exploitation requires administrator credentials. The vulnerability is in specific plugin parameters with insufficient sanitization.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.03 or later
Vendor Advisory: https://wordpress.org/plugins/wp-hello-bar/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find WP Hello Bar and click 'Update Now'. 4. Verify plugin version is 1.03 or higher.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily disable the vulnerable plugin until patched
wp plugin deactivate wp-hello-bar
Restrict Admin Access
allImplement strict access controls and monitoring for administrator accounts
🧯 If You Can't Patch
- Remove the WP Hello Bar plugin completely from your WordPress installation
- Implement web application firewall rules to block XSS payloads targeting the vulnerable parameters
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for WP Hello Bar version 1.02 or earlierCheck Version:
wp plugin list --name=wp-hello-bar --field=versionVerify Fix Applied:
Verify plugin version shows 1.03 or higher after update📡 Detection & Monitoring
Log Indicators:
- Unusual administrator account activity
- POST requests containing script tags to wp-hello-bar endpoints
- Modifications to plugin files or settings
Network Indicators:
- HTTP requests with script payloads in digit_one or digit_two parameters
- Unusual outbound connections from WordPress server
SIEM Query:
source="wordpress.log" AND ("wp-hello-bar" AND ("digit_one" OR "digit_two") AND ("<script>" OR "javascript:"))🔗 References
- https://downloads.wordpress.org/plugin/wp-hello-bar.1.02.zip
- https://plugins.trac.wordpress.org/browser/wp-hello-bar/tags/1.02/wp-hello-bar.php#L152
- https://plugins.trac.wordpress.org/browser/wp-hello-bar/tags/1.02/wp-hello-bar.php#L214
- https://plugins.trac.wordpress.org/browser/wp-hello-bar/tags/1.02/wp-hello-bar.php#L222
- https://wordpress.org/plugins/wp-hello-bar/
- https://www.wordfence.com/threat-intel/vulnerabilities/id/73b55486-adb8-40c6-9113-c98618d9cb00?source=cve
