CVE-2026-10552 Blue Captcha <= 2.0.1 - Cross-Site Request Forgery via 'blcap_action' Parameter
Unauthenticated attackers can trick admins into uninstalling the plugin, deleting logs, or banning IPs via forged requests due to missing nonce validation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-10552?
CVE-2026-10552 is a medium-severity vulnerability in jotis Blue Captcha, published on 24 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-352
Which versions are affected by CVE-2026-10552?
How do I fix CVE-2026-10552?
No fix has been published for CVE-2026-10552 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-10552 being exploited?
There is no known exploitation of CVE-2026-10552 in the wild and no public exploit code.
Sources
Also known as GHSA-r3xp-pqgc-3wvf.