CVE-2025-3924: WordPress Ultimate Profile Auth Bypass

CVE-2025-3924 Overview

CVE-2025-3924 affects the PeproDev Ultimate Profile Solutions plugin for WordPress. The vulnerability exists in the plugin's publicly exposed reset-password endpoint, which returns the valid_email value for any supplied username without verifying the requester's identity. Unauthenticated attackers can enumerate email addresses for any registered account, including administrators. The flaw is categorized under [CWE-285] Improper Authorization and affects plugin versions up to and including 7.5.2. Successful exploitation exposes user email addresses, enabling targeted phishing and credential-stuffing campaigns against WordPress site operators.

Critical Impact
Unauthenticated attackers can enumerate email addresses of any registered user, including administrators, enabling downstream phishing and account takeover attempts.

Affected Products

PeproDev Ultimate Profile Solutions plugin for WordPress
Plugin versions up to and including 7.5.2
WordPress sites using the plugin's reset-password endpoint

Discovery Timeline

2025-05-07 - CVE-2025-3924 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-3924

Vulnerability Analysis

The PeproDev Ultimate Profile Solutions plugin exposes a reset-password endpoint that accepts a username parameter and returns the valid_email associated with that account. The endpoint performs no authentication check and no correlation between the requester and the target account. Any client on the network can submit a username and receive the associated email address. The affected logic resides in login/login.php around lines 1483, 2659, and 2810 in version 7.5.2. Because WordPress usernames are often trivially discoverable through author archives and REST endpoints, attackers can pair enumeration of usernames with this endpoint to compile complete username-to-email mappings for a site.

Root Cause

The root cause is missing authorization on the reset-password lookup handler. The plugin treats the reset-password flow as a public utility and returns account metadata without confirming that the caller controls the account or has otherwise proven identity. There is no rate limiting, no token challenge, and no obfuscation of the response. This design violates the principle of least privilege and enables unbounded information disclosure.

Attack Vector

An unauthenticated attacker sends crafted HTTP requests to the plugin's reset-password endpoint with a target username. The response reveals the valid_email field tied to that account. The attacker iterates through candidate usernames — including admin, author slugs, and common names — to build an email list. No user interaction, credentials, or privileges are required. The vulnerability is exploitable remotely over the network against any WordPress site running the vulnerable plugin.

No public proof-of-concept code is currently available. Technical details on the affected code paths are documented in the WordPress Plugin Code Reference and the Wordfence Vulnerability Intelligence entry.

Detection Methods for CVE-2025-3924

Indicators of Compromise

Repeated HTTP requests to the PeproDev Ultimate Profile Solutions reset-password endpoint containing varying username parameter values
Sequential enumeration patterns targeting usernames such as admin, administrator, or author slugs harvested from /wp-json/wp/v2/users or ?author= endpoints
Unusual spikes in reset-password endpoint traffic from a single IP or narrow IP range with no matching successful password reset completions

Detection Strategies

Inspect web server access logs for high-volume GET or POST requests to plugin URLs under peprodev-ups referencing reset-password actions
Correlate reset-password lookups with subsequent phishing emails or login attempts against enumerated accounts
Deploy web application firewall rules that flag more than a small threshold of reset-password lookups per source IP within a short window

Monitoring Recommendations

Enable verbose logging on WordPress and forward access logs to a centralized logging platform for retention and analytics
Alert on repeated 200-OK responses from the plugin's reset-password endpoint tied to distinct username values from the same source
Track outbound phishing reports from users whose accounts exist on the affected site as a downstream indicator of enumeration

How to Mitigate CVE-2025-3924

Immediate Actions Required

Identify all WordPress installations running the PeproDev Ultimate Profile Solutions plugin and confirm the installed version
Update the plugin to a version later than 7.5.2 that addresses the authorization gap, or deactivate and remove the plugin if no fixed version is available
Restrict access to the plugin's reset-password endpoint through a web application firewall until a patch is deployed

Patch Information

Review the WordPress Plugin Developer Info page for the latest release and changelog. Site owners should apply any vendor-issued update that adds authorization checks to the reset-password handler and validates that the requester owns the target account before returning email data.

Workarounds

Block or rate-limit direct requests to the plugin's reset-password endpoint at the WAF or reverse proxy layer
Disable the plugin's public reset-password functionality if the site does not require self-service password resets
Harden username exposure by disabling REST user enumeration and author archive scanning to raise the cost of pairing usernames with the vulnerable endpoint

bash

# Example nginx rule to rate-limit the vulnerable endpoint
limit_req_zone $binary_remote_addr zone=preset:10m rate=5r/m;

location ~* /wp-content/plugins/peprodev-ups/ {
    limit_req zone=preset burst=3 nodelay;
}