CVE-2025-23958: Editor Wysiwyg Auth Bypass Vulnerability

CVE-2025-23958 Overview

CVE-2025-23958 is a Missing Authorization vulnerability [CWE-862] affecting the FADI MED Editor Wysiwyg Background Color plugin for WordPress. The flaw impacts all versions of editor-wysiwyg-background-color up to and including 1.0. Attackers can exploit incorrectly configured access control security levels over the network without authentication or user interaction. Successful exploitation allows unauthorized actions against the plugin's protected functionality, resulting in limited integrity and availability impact on the WordPress site.

Critical Impact
Unauthenticated remote attackers can bypass access control checks in the plugin to perform actions restricted to privileged users.

Affected Products

FADI MED Editor Wysiwyg Background Color plugin for WordPress
Versions from n/a through 1.0 (inclusive)
WordPress sites with editor-wysiwyg-background-color plugin installed and active

Discovery Timeline

2025-04-17 - CVE-2025-23958 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-23958

Vulnerability Analysis

The vulnerability stems from missing authorization checks within the FADI MED Editor Wysiwyg Background Color plugin. The plugin exposes functionality without verifying whether the requesting user holds the required capability or role. This design flaw falls under CWE-862 (Missing Authorization), where the application fails to enforce access control on sensitive operations. Attackers reach the vulnerable endpoints over the network with no prior authentication. The EPSS probability of 0.336% places this vulnerability in the 25th percentile for exploitation likelihood.

Root Cause

The root cause is the absence of capability checks such as current_user_can() on plugin actions or AJAX handlers. WordPress plugins must validate user roles before executing privileged actions. The editor-wysiwyg-background-color plugin registers handlers that execute without confirming the caller's authorization level. This omission allows any unauthenticated visitor to invoke functionality intended for administrators or editors.

Attack Vector

Exploitation requires only network access to the target WordPress site. An attacker crafts HTTP requests to the plugin's exposed endpoints and issues them directly. No credentials, session tokens, or social engineering are required. Because the plugin does not verify authorization, the server processes the requests as legitimate. The vulnerability affects confidentiality minimally but permits unauthorized modification and service disruption. Refer to the Patchstack WordPress Vulnerability entry for additional technical context.

Detection Methods for CVE-2025-23958

Indicators of Compromise

Unexpected HTTP POST or GET requests to editor-wysiwyg-background-color plugin paths from unauthenticated sources
Unauthorized modifications to editor background color settings or related plugin options in the WordPress database
Access log entries showing requests to plugin endpoints without preceding authentication cookies

Detection Strategies

Inventory WordPress installations to identify sites running the editor-wysiwyg-background-color plugin at version 1.0 or earlier
Monitor web server access logs for anomalous request patterns targeting plugin admin-ajax actions or REST routes
Correlate WordPress audit logs with unauthenticated network traffic reaching plugin handlers

Monitoring Recommendations

Enable a WordPress security audit log plugin to record option and setting changes with actor attribution
Deploy a web application firewall (WAF) with rules that block unauthenticated access to plugin administrative endpoints
Alert on repeated 200-status responses to plugin URIs originating from anonymous sessions

How to Mitigate CVE-2025-23958

Immediate Actions Required

Deactivate and remove the FADI MED Editor Wysiwyg Background Color plugin until a patched version is confirmed available
Audit WordPress option tables and content for unauthorized modifications introduced through the vulnerable endpoints
Restrict access to /wp-admin/admin-ajax.php and plugin-specific paths using network-level or WAF controls

Patch Information

At the time of publication, no vendor-supplied fix is listed for versions up to and including 1.0. Site owners should consult the Patchstack advisory for updated remediation status and replace the plugin with a maintained alternative if a patch remains unavailable.

Workarounds

Remove the plugin entirely and use an actively maintained WordPress editor styling alternative
Apply WAF virtual patching rules that reject unauthenticated requests to plugin endpoints
Enforce IP allowlisting on WordPress admin routes to reduce exposure of vulnerable handlers

bash

# Configuration example: block unauthenticated access to the plugin path via nginx
location ~* /wp-content/plugins/editor-wysiwyg-background-color/ {
    deny all;
    return 403;
}