CVE-2025-52738: Wikipedia Preview Auth Bypass Flaw

CVE-2025-52738 Overview

CVE-2025-52738 is a Missing Authorization vulnerability [CWE-862] in the Wikimedia Foundation Wikipedia Preview plugin for WordPress. The flaw affects all versions up to and including 1.15.0. Attackers can exploit incorrectly configured access control security levels to interact with plugin functionality without proper authorization checks. The vulnerability is network-exploitable, requires no authentication, and needs no user interaction. Successful exploitation results in limited integrity and availability impact on affected WordPress installations.

Critical Impact
Unauthenticated attackers can invoke restricted plugin actions over the network, undermining access control boundaries in WordPress sites running the Wikipedia Preview plugin.

Affected Products

Wikimedia Foundation Wikipedia Preview plugin for WordPress
All versions from n/a through 1.15.0
WordPress sites with the wikipedia-preview plugin installed

Discovery Timeline

2025-10-22 - CVE-2025-52738 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-52738

Vulnerability Analysis

The Wikipedia Preview plugin exposes functionality without enforcing proper authorization checks on privileged actions. This is a Broken Access Control weakness classified under [CWE-862] Missing Authorization. The plugin fails to validate whether the requesting user holds the capability required to execute the targeted operation.

Because the attack vector is network-based and requires no privileges or user interaction, remote actors can send crafted HTTP requests directly to the plugin's endpoints. The impact is scoped to limited integrity and availability effects, with no direct confidentiality loss reported.

The EPSS probability for near-term exploitation is 0.29%, and no public exploit or CISA KEV listing is available at the time of publication.

Root Cause

The root cause is the absence of capability or nonce checks on one or more plugin request handlers. WordPress plugins are expected to gate privileged actions using current_user_can() verification and check_admin_referer() or check_ajax_referer() nonce validation. When these guards are missing or misconfigured, any anonymous requester can reach the underlying handler logic.

Attack Vector

An unauthenticated remote attacker crafts an HTTP request targeting the vulnerable plugin endpoint on a WordPress site running Wikipedia Preview <= 1.15.0. Because authorization is not enforced, the server processes the request and performs the restricted action. No exploitation code has been publicly released, and details are available in the Patchstack Vulnerability Report.

Detection Methods for CVE-2025-52738

Indicators of Compromise

Unexpected HTTP POST or GET requests to wikipedia-preview plugin endpoints originating from unauthenticated sessions.
WordPress access logs showing requests to admin-ajax.php or REST routes tied to the plugin without a valid authenticated user cookie.
Unexpected changes to plugin-managed settings or content elements on the site.

Detection Strategies

Inventory WordPress installations to identify sites running the wikipedia-preview plugin at version 1.15.0 or earlier.
Review web server and WordPress audit logs for anonymous access patterns targeting plugin-specific action names or REST endpoints.
Deploy WordPress security plugins or a Web Application Firewall (WAF) with rules that flag unauthenticated invocations of privileged plugin actions.

Monitoring Recommendations

Alert on HTTP 200 responses to plugin endpoints when the request lacks a valid WordPress authentication cookie or nonce parameter.
Track anomalous request volume against /wp-admin/admin-ajax.php correlated to Wikipedia Preview actions.
Monitor plugin file integrity and configuration state to detect unauthorized modifications.

How to Mitigate CVE-2025-52738

Immediate Actions Required

Identify all WordPress instances with the Wikipedia Preview plugin installed and record their versions.
Upgrade the wikipedia-preview plugin to a patched release above 1.15.0 as soon as it becomes available from the Wikimedia Foundation.
If a fixed version is not yet available, disable and remove the plugin until a patched build is published.
Restrict administrative and AJAX endpoints behind authentication proxies or IP allowlists where feasible.

Patch Information

Refer to the Patchstack Vulnerability Report for authoritative patch status. The vulnerability affects versions through 1.15.0; site owners should upgrade to any subsequent version that documents a fix for this broken access control issue.

Workarounds

Deactivate the Wikipedia Preview plugin until a patched version is deployed.
Apply WAF rules that block unauthenticated requests to plugin-specific action names in admin-ajax.php and REST endpoints.
Enforce least-privilege access for WordPress user roles and audit installed plugins on a regular schedule.

bash

# Configuration example: disable the plugin via WP-CLI until patched
wp plugin deactivate wikipedia-preview
wp plugin status wikipedia-preview