CVE-2026-1640
📋 TL;DR
The Taskbuilder WordPress plugin has an authorization bypass vulnerability that allows authenticated users (subscriber level or higher) to post comments on any project or task, including private ones they shouldn't access. Attackers can inject arbitrary HTML and CSS through insufficiently sanitized comment fields. All WordPress sites using Taskbuilder versions up to 5.0.2 are affected.
💻 Affected Systems
- Taskbuilder – WordPress Project Management & Task Management 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 inject malicious scripts via HTML/CSS injection, potentially leading to cross-site scripting attacks, session hijacking, or credential theft against administrators viewing the comments.
Likely Case
Unauthorized users post spam comments, leak sensitive information from private projects, or disrupt project management workflows by injecting disruptive content.
If Mitigated
With proper access controls and input validation, impact is limited to minor data integrity issues within the comment system.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward via AJAX endpoints. The vulnerability details are publicly documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.0.3 or later
Vendor Advisory: https://plugins.trac.wordpress.org/browser/taskbuilder
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find Taskbuilder plugin. 4. Click 'Update Now' if update available. 5. If no update appears, manually download version 5.0.3+ from WordPress repository and replace plugin files.
🔧 Temporary Workarounds
Disable vulnerable AJAX endpoints
allRemove or restrict access to the vulnerable comment submission functions via .htaccess or WordPress hooks
Add to .htaccess: RewriteRule ^wp-admin/admin-ajax\.php\?action=wppm_submit_(proj|task)_comment - [F]
Temporary plugin deactivation
linuxDisable Taskbuilder plugin until patched version is available
wp plugin deactivate taskbuilder
🧯 If You Can't Patch
- Implement strict user role validation for all project/task comment functions
- Add input sanitization filters for comment_body parameter using WordPress sanitization functions
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Taskbuilder version. If version is 5.0.2 or lower, system is vulnerable.Check Version:
wp plugin get taskbuilder --field=versionVerify Fix Applied:
After update, verify Taskbuilder version shows 5.0.3 or higher in WordPress plugins list.📡 Detection & Monitoring
Log Indicators:
- Unusual AJAX requests to wppm_submit_proj_comment or wppm_submit_task_comment endpoints from unauthorized users
- Multiple comment submissions from single user across different projects
Network Indicators:
- POST requests to /wp-admin/admin-ajax.php with action parameters matching vulnerable endpoints
SIEM Query:
source="wordpress_logs" AND (uri_path="/wp-admin/admin-ajax.php" AND query_string="*action=wppm_submit_*_comment*")🔗 References
- https://plugins.trac.wordpress.org/browser/taskbuilder/tags/5.0.2/includes/admin/projects/open_project/wppm_submit_project_comment.php#L6
- https://plugins.trac.wordpress.org/browser/taskbuilder/tags/5.0.2/includes/admin/tasks/open_task/wppm_submit_task_comment.php#L6
- https://www.wordfence.com/threat-intel/vulnerabilities/id/66095908-875f-486d-ae77-6015671872de?source=cve
