CVE-2025-22319: MashShare Authorization Bypass Vulnerability

CVE-2025-22319 Overview

CVE-2025-22319 is a Missing Authorization vulnerability [CWE-862] in the DearHive Social Media Share Buttons | MashShare plugin for WordPress. The flaw affects all plugin versions up to and including 4.0.47. An authenticated attacker with low privileges can invoke plugin functionality that should be restricted to higher-privileged roles. The issue is categorized as broken access control and stems from missing capability checks on one or more plugin actions.

Critical Impact
Low-privileged authenticated WordPress users can access MashShare plugin functionality without proper authorization, leading to limited integrity impact on affected sites.

Affected Products

DearHive Social Media Share Buttons | MashShare (MashSharer) WordPress plugin
All versions from n/a through 4.0.47
WordPress sites running the vulnerable plugin

Discovery Timeline

2025-01-07 - CVE-2025-22319 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-22319

Vulnerability Analysis

The vulnerability is a broken access control issue in the MashShare WordPress plugin. The plugin exposes functionality that does not enforce a proper capability or role check before executing. As a result, any authenticated user, including a Subscriber-level account, can invoke actions intended for administrators or editors.

The attack requires network access and low privileges. No user interaction is needed. Successful exploitation results in a limited integrity impact on the affected WordPress site, with no direct confidentiality or availability consequences reported.

Because WordPress installations commonly allow open user registration, the low privilege barrier is easy to satisfy on many production sites. This lowers the effective attack cost significantly compared to purely admin-facing bugs.

Root Cause

The root cause is a missing authorization check [CWE-862] on a plugin endpoint or action handler. The code path executes plugin logic without calling current_user_can() or verifying nonces against a privileged capability. This design flaw permits any authenticated session to reach sensitive functionality.

Attack Vector

An attacker registers or obtains any authenticated WordPress account on a site running MashShare <= 4.0.47. The attacker then issues an HTTP request to the vulnerable plugin action (typically an admin-ajax.php or REST endpoint exposed by the plugin). Because the handler does not validate the caller's capability, the request is processed and the attacker modifies plugin state or triggers unintended behavior. Refer to the Patchstack advisory for endpoint-level details.

Detection Methods for CVE-2025-22319

Indicators of Compromise

Unexpected changes to MashShare plugin settings or share button configuration in the WordPress database.
HTTP POST requests to plugin AJAX or REST endpoints originating from low-privileged user sessions.
New or modified plugin option rows in wp_options with keys prefixed by the MashShare namespace.

Detection Strategies

Audit WordPress access logs for authenticated requests to admin-ajax.php or /wp-json/ endpoints associated with the MashShare plugin.
Compare current plugin settings against a known-good baseline to identify unauthorized modifications.
Enumerate installed plugin versions across the estate and flag any MashShare instance at version 4.0.47 or earlier.

Monitoring Recommendations

Enable WordPress audit logging to capture option changes and privileged action invocations by non-admin users.
Monitor for unusual user registration spikes followed by administrative-style requests from those accounts.
Alert on modifications to plugin configuration outside of scheduled administrative windows.

How to Mitigate CVE-2025-22319

Immediate Actions Required

Update the MashShare plugin to a version later than 4.0.47 as soon as the vendor publishes a fixed release.
Review the WordPress user list and remove untrusted or unused low-privileged accounts.
Disable open user registration if it is not required by the site's business logic.

Patch Information

Refer to the Patchstack advisory for CVE-2025-22319 for the current patch status and upgrade guidance. Administrators should apply the vendor-issued update once available and confirm the installed version is above 4.0.47.

Workarounds

Temporarily deactivate the MashShare plugin until a patched version is deployed.
Restrict access to admin-ajax.php and plugin REST routes using a Web Application Firewall rule that requires an administrator capability.
Set the WordPress users_can_register option to false to prevent unauthenticated attackers from obtaining a low-privileged foothold.

bash

# Configuration example: disable open registration via WP-CLI
wp option update users_can_register 0

# Deactivate the vulnerable plugin until patched
wp plugin deactivate mashsharer