CVE-2025-48166: Stop and Block Bots Auth Bypass Flaw

CVE-2025-48166 Overview

CVE-2025-48166 is a missing authorization vulnerability in the sminozzi Stop and Block bots plugin (Anti bots / antibots) for WordPress. The flaw affects all versions up to and including 1.48. Unauthenticated attackers can reach plugin functionality that is not properly constrained by access control lists (ACLs).

The issue is classified under CWE-862: Missing Authorization. It is exploitable over the network without user interaction or privileges. Successful exploitation results in limited integrity impact on the affected WordPress site.

Critical Impact
Unauthenticated attackers can invoke plugin functionality without authorization checks, potentially altering plugin state or configuration on affected WordPress sites.

Affected Products

sminozzi Stop and Block bots plugin Anti bots (antibots) — versions through 1.48
WordPress installations running the vulnerable plugin
Sites relying on the plugin for bot mitigation controls

Discovery Timeline

2025-07-16 - CVE-2025-48166 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-48166

Vulnerability Analysis

The vulnerability stems from missing authorization checks on plugin functionality exposed by the Stop and Block bots plugin Anti bots. WordPress plugins commonly expose administrative actions through AJAX handlers, admin-post endpoints, or REST routes. Each of these entry points must verify user capabilities and nonces before executing privileged logic.

In versions up to 1.48, one or more of these entry points lack such checks. As a result, requests from unauthenticated actors can reach code paths intended for administrators. The scope is limited to integrity impact, which suggests the exposed functionality allows modification of plugin settings or state rather than data disclosure or service disruption.

The attack requires no authentication, no user interaction, and no elevated privileges. It can be launched remotely against any exposed WordPress site running the affected plugin version.

Root Cause

The root cause is the absence of capability checks such as current_user_can() and nonce verification via check_ajax_referer() or wp_verify_nonce() on plugin action handlers. Without these controls, WordPress does not enforce access restrictions on the affected endpoints. Refer to the Patchstack Vulnerability Report for specific handler details.

Attack Vector

An attacker sends crafted HTTP requests to the unprotected plugin endpoint on a vulnerable WordPress site. Because the endpoint does not validate the requester's role or session, the request proceeds and triggers the underlying functionality. This exposure is network-reachable and requires no prior foothold.

// No verified proof-of-concept code is publicly available for CVE-2025-48166.
// See the Patchstack advisory referenced above for endpoint-level details.

Detection Methods for CVE-2025-48166

Indicators of Compromise

Unauthenticated POST or GET requests to plugin-specific paths under /wp-admin/admin-ajax.php or /wp-admin/admin-post.php referencing antibots actions.
Unexpected modifications to plugin settings, allowlists, or blocklists within the Anti bots plugin configuration.
Access log entries containing the plugin's action parameters from external IP addresses without prior authenticated sessions.

Detection Strategies

Review WordPress access logs for requests to plugin endpoints that lack a valid authenticated session cookie or nonce parameter.
Compare current plugin settings against a known-good baseline to identify unauthorized changes.
Deploy a web application firewall rule that flags requests targeting antibots action handlers from unauthenticated clients.

Monitoring Recommendations

Enable WordPress audit logging to capture changes to plugin options and settings tables.
Monitor the wp_options table for unexpected writes to antibots-related keys.
Alert on spikes in traffic to admin-ajax.php with action parameters tied to the vulnerable plugin.

How to Mitigate CVE-2025-48166

Immediate Actions Required

Update the Stop and Block bots plugin Anti bots to a version later than 1.48 once released by the vendor.
If no fixed version is available, deactivate and remove the plugin from affected WordPress installations.
Audit plugin settings and revert any unauthorized configuration changes.

Patch Information

At the time of NVD publication, the advisory listed affected versions from n/a through <= 1.48. Consult the Patchstack Vulnerability Report for the current patch status and recommended fixed version.

Workarounds

Restrict access to /wp-admin/admin-ajax.php and /wp-admin/admin-post.php at the web server or WAF layer for the plugin's specific action parameters.
Apply virtual patching rules through a WordPress security plugin or WAF to enforce authentication on antibots endpoints.
Limit administrative access to trusted IP ranges while a vendor patch is pending.

bash

# Example nginx rule to block unauthenticated requests to antibots actions
location = /wp-admin/admin-ajax.php {
    if ($arg_action ~* "antibots") {
        # Require a valid WordPress logged-in cookie
        if ($http_cookie !~* "wordpress_logged_in_") {
            return 403;
        }
    }
}