CVE-2023-40200: WP Logo Showcase Auth Bypass Vulnerability

CVE-2023-40200 Overview

CVE-2023-40200 is an authorization bypass vulnerability in the WP Logo Showcase Responsive Slider and Carousel plugin for WordPress. The flaw is classified as Insecure Direct Object Reference [CWE-639], where the application uses a user-controlled key to identify resources without enforcing proper access control checks. Attackers can manipulate identifiers in requests to access or modify data belonging to other users. The plugin is affected from unspecified versions through 3.6. The issue impacts integrity of plugin-managed data but does not directly expose confidential information or affect availability.

Critical Impact

Unauthenticated remote attackers can bypass access controls over the network and modify plugin resources without user interaction.

Affected Products

• WP Logo Showcase Responsive Slider and Carousel plugin for WordPress
• All versions from initial release through 3.6
• WordPress sites running the Essential Plugin distribution of this component

Discovery Timeline

• 2026-06-11 - CVE-2023-40200 published to NVD
• 2026-06-11 - Last updated in NVD database

Technical Details for CVE-2023-40200

Vulnerability Analysis

The vulnerability stems from broken access control in plugin endpoints handling logo showcase resources. The plugin accepts identifiers supplied in HTTP requests and acts on the referenced objects without verifying that the caller is authorized to operate on them. This pattern matches the Insecure Direct Object Reference class described in [CWE-639]. The attack is reachable over the network and requires no authentication or user interaction. Successful exploitation impacts data integrity by allowing unauthorized modification of plugin-managed entities.

Root Cause

The plugin relies on a user-controlled key to select target objects but does not enforce ownership or capability checks before processing the request. Authorization decisions are skipped or delegated entirely to request parameters that the client controls. Any request containing a valid-looking identifier is accepted, regardless of the caller's WordPress role.

Attack Vector

An unauthenticated attacker sends crafted HTTP requests to the vulnerable plugin endpoint with manipulated object identifiers. Because the server trusts the supplied key, the attacker can perform actions intended for privileged users. No authentication tokens, nonces, or capability checks gate the operation. See the Patchstack Vulnerability Report for additional technical context.

No verified public proof-of-concept code is available for this issue, so exploitation specifics are described in prose rather than reproduced here.

Detection Methods for CVE-2023-40200

Indicators of Compromise

• Unexpected modifications to logo showcase entries, sliders, or carousel configurations created by anonymous or unauthenticated sessions
• Unauthenticated POST or GET requests to plugin AJAX or REST endpoints associated with wp-logo-showcase-responsive-slider
• Sequential or enumerated identifier values appearing in plugin-related request logs from a single source

Detection Strategies

• Inspect WordPress access logs for requests to plugin endpoints lacking a valid authenticated session cookie
• Correlate plugin database row changes with the originating HTTP request to confirm the actor had appropriate privileges
• Deploy WordPress security plugins or web application firewall rules that flag IDOR patterns against known plugin URLs

Monitoring Recommendations

• Enable WordPress audit logging to record administrative actions performed against plugin-managed objects
• Forward web server logs to a centralized analytics platform and alert on anomalous request volumes targeting plugin endpoints
• Track the installed plugin inventory and version across all WordPress sites to identify exposed instances of version 3.6 or earlier

How to Mitigate CVE-2023-40200

Immediate Actions Required

• Update WP Logo Showcase Responsive Slider and Carousel to a version later than 3.6 as soon as a patched release is available
• Audit plugin-managed data for unauthorized changes since the plugin was installed
• Restrict network access to the WordPress admin and AJAX endpoints where feasible

Patch Information

The vulnerability affects the plugin from initial release through version 3.6. Site administrators should consult the Patchstack Vulnerability Report and the WordPress plugin repository for the latest fixed release. Apply the update across all environments and verify the installed version after deployment.

Workarounds

• Deactivate and remove the plugin until a patched version is installed if business requirements permit
• Add a web application firewall rule that blocks unauthenticated requests to the plugin's action handlers
• Limit administrative URLs to trusted IP ranges using web server access controls

# Example: block unauthenticated access to the plugin endpoints via nginx
location ~* /wp-content/plugins/wp-logo-showcase-responsive-slider-slider/ {
    allow 10.0.0.0/8;
    deny all;
}