Atomic Edge analysis of CVE-2025-48166 (metadata-based):
The Stop and Block bots plugin, Anti bots, versions up to and including 1.48 contain a missing authorization vulnerability. The CWE-862 classification indicates that a function performs an unauthorized action without checking user capabilities or authentication. The CVSS vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N) confirms that an unauthenticated attacker can exploit this over the network with low complexity, leading to a low integrity impact. The exact vulnerable function and its action are not disclosed in the metadata, but the plugin slug and WordPress conventions allow us to infer likely attack vectors.
Root Cause:
Atomic Edge research identifies the root cause as a missing capability check on a function exposed through an HTTP endpoint. This likely occurs in an AJAX handler, admin-post handler, or a REST API route where the callback executes without verifying user permissions. Since the plugin is designed to block bots, the vulnerability may involve a function that manages bot block rules, logs, or settings. The affected endpoint probably registers a callback with ‘wp_ajax_’ and ‘wp_ajax_nopriv_’ hooks, allowing unauthenticated requests. Without a capability check (like ‘current_user_can’ or a nonce), an attacker can invoke the function directly. These conclusions are inferred from the CWE and description; the exact code is not available for verification.
Exploitation:
An attacker can likely exploit this by sending a crafted HTTP request to a WordPress endpoint. Based on common plugin patterns, the vulnerable action may be an AJAX action such as ‘antibots_update_rules’ or a REST route like ‘/wp-json/antibots/v1/update’. Since the vulnerability requires no authentication, a simple POST request to ‘/wp-admin/admin-ajax.php’ with the ‘action’ parameter set to the vulnerable hook name could trigger unauthorized behavior. Alternatively, if the function is exposed via ‘admin-post.php’, the attacker can send a POST request with a known action. The absence of a nonce check in the callback makes these requests succeed. The attacker does not need to provide any special parameters if the function performs a destructive action, but might need to supply a parameter like ‘block’ or ‘log’ to control the action. Without the specific action name, the PoC must be illustrative and adaptable.
Remediation:
The fix likely requires adding proper authorization checks to the vulnerable function. This includes verifying that the request is authenticated and that the user has the required capability (e.g., ‘manage_options’) before performing the action. Additionally, the plugin should implement and verify a nonce for all requests that modify state. The patch in version 1.50 likely adds these checks, ensuring that only authorized users can invoke the function. Developers should audit all AJAX, admin-post, and REST endpoints to verify they enforce both authentication and capability checks.
Impact:
If exploited, this vulnerability allows an unauthenticated attacker to perform unauthorized actions that affect the plugin’s functionality. Since the CVSS vector indicates low integrity impact, the attacker might be able to modify bot-blocking rules, disable protections, or alter logs. This could degrade site security by allowing malicious bots to bypass the bot-blocking features, leading to increased spam, brute-force attempts, or other automated attacks. The attacker cannot read sensitive data or escalate privileges, but the integrity loss could have operational consequences.
