Blue Captcha <= 2.0.1 - Cross-Site Request Forgery via 'blcap_action' Parameter
| CVE | CVE-2026-10552 |
|---|---|
| CVSS | 4.3 (Medium) |
| Publicly Published | June 23, 2026 |
| Last Updated | June 24, 2026 |
| Researcher |
Kamil Królikowski
- Asseco Poland S.A.
|
Description
The Blue Captcha plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to and including 2.0.1. This is due to missing or incorrect nonce validation on the main admin panel (blcap_main_page) and on the Hall of Shame and Log subpages, which accept a 'blcap_action' / 'action' parameter from $_REQUEST and perform destructive operations (plugin uninstall via blcap_uninstall(), log deletion via blcap_delete_logs(), Hall of Shame deletion via blcap_delete_ip_db(), and adding IPs to the banned list via update_option('blcap_settings')) with no wp_verify_nonce(), check_admin_referer(), or check_ajax_referer() calls anywhere in the codebase. This makes it possible for unauthenticated attackers to uninstall the plugin, delete audit logs, remove Hall of Shame entries, and add arbitrary IP addresses to the block list via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
References
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
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Vulnerability Details for Blue Captcha
| Software Type | Plugin |
|---|---|
| Software Slug | blue-captcha (view on wordpress.org) |
| Patched? | No |
| Remediation | No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement. |
| Affected Version |
|
Recent vulnerabilities in Blue Captcha
| # | Title | CVE ID | CVSS | Researchers | Date |
|---|---|---|---|---|---|
| 1 | Blue Captcha <= 1.7.4 - Reflected Cross-Site Scripting | CVE-2025-28880 | Le Ngoc Anh | March 24, 2025 |
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