CVE-2025-57944: Skimlinks Authorization Bypass Vulnerability

CVE-2025-57944 Overview

CVE-2025-57944 is a missing authorization vulnerability in the Skimlinks Affiliate Marketing Tool plugin for WordPress. The plugin fails to enforce access control on functionality that should be restricted, allowing unauthenticated network attackers to reach features not properly constrained by access control lists (ACLs). The flaw affects all versions of the plugin up to and including 1.3. The issue is categorized under [CWE-862] Missing Authorization and can be triggered remotely without user interaction or privileges.

Critical Impact
Unauthenticated attackers can access plugin functionality that should be restricted, resulting in low-impact integrity changes on affected WordPress sites.

Affected Products

Skimlinks Affiliate Marketing Tool plugin for WordPress
All versions from n/a through 1.3
WordPress sites with the plugin installed and activated

Discovery Timeline

2025-09-22 - CVE-2025-57944 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-57944

Vulnerability Analysis

The Skimlinks Affiliate Marketing Tool plugin exposes functionality without verifying whether the requester holds the required capabilities. The vulnerability falls under broken access control, specifically missing authorization checks on one or more plugin endpoints. Attackers can reach these endpoints over the network without authenticating and without user interaction. Exploitation impacts integrity in a limited scope, with no direct effect on confidentiality or availability of the underlying site.

Root Cause

The root cause is the absence of capability or nonce checks on plugin handlers that perform state-changing actions. WordPress plugins are expected to gate privileged operations using current_user_can() and check_admin_referer() or wp_verify_nonce(). In versions up to 1.3, at least one action handler executes without these controls, allowing any visitor to invoke it. This pattern maps directly to CWE-862, where an actor can access a resource because required authorization logic is missing.

Attack Vector

Exploitation occurs remotely over HTTP against a vulnerable WordPress site running the Skimlinks plugin. An attacker sends a crafted request to the exposed plugin endpoint, typically through admin-ajax.php, a REST route, or a plugin action hook. Because no authentication or capability check runs before the sensitive logic executes, the request succeeds. The Patchstack advisory describes this as a broken access control condition in the plugin. See the Patchstack Vulnerability Report for advisory details.

No verified public exploit code is available for this issue at the time of writing.

Detection Methods for CVE-2025-57944

Indicators of Compromise

Unauthenticated POST or GET requests to plugin-specific endpoints under /wp-admin/admin-ajax.php or /wp-json/ referencing the skimlinks action or namespace
Unexpected modifications to Skimlinks plugin settings or affiliate configuration recorded in the wp_options table
Requests originating from IPs with no prior authenticated session that trigger plugin actions

Detection Strategies

Inventory WordPress installations and identify sites running the Skimlinks Affiliate Marketing Tool at version 1.3 or earlier
Inspect web server access logs for anonymous requests targeting Skimlinks plugin action names or REST routes
Correlate plugin configuration changes in the WordPress audit log with the source IP and authentication state of the request

Monitoring Recommendations

Enable a WordPress activity log plugin to record option changes and administrative actions with associated user identity
Alert on any Skimlinks-related admin-ajax or REST call issued without a valid authenticated cookie
Baseline normal plugin request patterns and flag anomalous request volume from single sources

How to Mitigate CVE-2025-57944

Immediate Actions Required

Update the Skimlinks Affiliate Marketing Tool plugin to a version above 1.3 once released by the vendor
If no fixed version is available, deactivate and remove the plugin until a patch is published
Review plugin settings and affiliate link configurations for unauthorized modifications

Patch Information

At the time of publication, the NVD entry lists affected versions from n/a through 1.3 and does not identify a fixed version. Administrators should consult the Patchstack Vulnerability Report and the plugin's WordPress.org page for updated release information before reinstalling.

Workarounds

Block anonymous access to Skimlinks plugin endpoints at the web application firewall (WAF) or reverse proxy layer
Restrict /wp-admin/admin-ajax.php calls tied to the plugin's action names to authenticated administrator sessions
Apply virtual patching rules from a WordPress security provider that specifically address CVE-2025-57944

bash

# Example nginx rule to block unauthenticated access to the plugin's admin-ajax action
location = /wp-admin/admin-ajax.php {
    if ($arg_action ~* "^skimlinks_") {
        # Require WordPress logged-in cookie
        if ($http_cookie !~* "wordpress_logged_in_") {
            return 403;
        }
    }
}