CVE-2025-31886: Repuso Social Proof Auth Bypass Vulnerability

CVE-2025-31886 is an authorization bypass flaw in Repuso Social Proof testimonials plugin affecting versions up to 5.21. Attackers can exploit misconfigured access controls to bypass authentication checks. This article covers technical details, affected versions, security impact, and mitigation strategies.

CVE-2025-31886 Overview

CVE-2025-31886 is a Missing Authorization vulnerability [CWE-862] in the Repuso Social Proof Testimonials and Reviews WordPress plugin (social-testimonials-and-reviews-widget). The flaw affects all versions up to and including 5.21. It stems from incorrectly configured access control security levels on one or more plugin actions. An authenticated attacker with low privileges can invoke functionality that should require higher authorization, leading to an integrity impact on the affected WordPress site. The issue is exploitable over the network without user interaction.

Critical Impact
Authenticated users with minimal privileges can bypass access controls in the Repuso plugin and perform actions restricted to higher-privileged roles, compromising site integrity.

Affected Products

Repuso Social Proof Testimonials and Reviews plugin (social-testimonials-and-reviews-widget) for WordPress
All versions from n/a through 5.21
WordPress sites where the plugin is installed and active

Discovery Timeline

2025-04-01 - CVE-2025-31886 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-31886

Vulnerability Analysis

The Repuso plugin exposes actions that do not properly verify the caller's authorization level. A low-privileged authenticated user, such as a subscriber, can issue requests that the plugin processes as if they came from an authorized role. The vulnerability affects integrity but does not expose confidential data or degrade availability, based on the CVSS vector. Exploitation is network-reachable, requires no user interaction, and has low attack complexity. The EPSS probability sits at 0.243%, placing this issue in the lower tail of predicted exploitation activity, though authenticated broken access control flaws in WordPress plugins are routinely weaponized by opportunistic actors.

Root Cause

The underlying weakness is classified as [CWE-862] Missing Authorization. The plugin registers AJAX or REST endpoints that execute privileged actions without a matching current_user_can() capability check or nonce-bound role validation. Because WordPress treats any logged-in user as authenticated, the missing check collapses the distinction between subscribers and administrators for the affected handlers.

Attack Vector

An attacker first obtains any authenticated account on the target WordPress instance. This can be a self-registered subscriber account on sites that allow open registration. The attacker then sends a crafted HTTP POST request to the vulnerable plugin endpoint, invoking configuration or content operations that should be reserved for administrators. See the Patchstack Vulnerability Report for the specific vulnerable action details.

No verified public exploit code is available for this CVE at the time of writing. The vulnerability mechanism is described in prose to avoid speculative code.

Detection Methods for CVE-2025-31886

Indicators of Compromise

Unexpected changes to Repuso plugin settings, widgets, or embedded testimonial content that cannot be attributed to an administrator action
Requests to admin-ajax.php or plugin REST routes containing Repuso action names originating from subscriber-level accounts
Newly registered low-privilege accounts followed by rapid requests to plugin endpoints

Detection Strategies

Review web server access logs for POST requests to plugin AJAX or REST endpoints correlated with non-administrator session cookies
Enable WordPress audit logging to capture option changes and plugin state modifications by user role
Compare the running plugin version against 5.21 and flag any deployment at or below that version as vulnerable

Monitoring Recommendations

Alert on privilege-action mismatches where low-privileged users trigger administrative plugin handlers
Monitor for spikes in new subscriber account registrations followed by plugin-scoped requests
Ingest WordPress and web server logs into a centralized analytics platform to correlate authentication events with plugin activity

How to Mitigate CVE-2025-31886

Immediate Actions Required

Update the Repuso Social Proof Testimonials and Reviews plugin to a version later than 5.21 as soon as the vendor publishes a fixed release
Disable open user registration on sites that do not require it, reducing the pool of accounts capable of exploiting the flaw
Audit existing low-privileged accounts for unexpected activity against plugin endpoints

Patch Information

At the time of this writing, the Patchstack Vulnerability Report is the authoritative reference. Administrators should monitor the plugin's WordPress.org listing for a release above 5.21 that addresses the authorization check. Apply the update through the WordPress admin dashboard or via WP-CLI once available.

Workarounds

Deactivate and remove the plugin until a fixed version ships if the functionality is not business-critical
Restrict access to wp-admin/admin-ajax.php and plugin REST routes for non-administrator roles using a web application firewall rule
Enforce strong role separation and disable self-registration by setting Anyone can register to off under WordPress General Settings

bash

# Configuration example: update the plugin via WP-CLI once a patched release is available
wp plugin update social-testimonials-and-reviews-widget

# Verify installed version is above 5.21
wp plugin get social-testimonials-and-reviews-widget --field=version

# Disable open user registration as a defense-in-depth measure
wp option update users_can_register 0