Overview
The cybersecurity community has identified a dangerous vulnerability in the PeproDev Ultimate Profile Solutions plugin for WordPress that allows unauthorized data modification. This vulnerability, designated CVE-2025-3921, affects all versions of the plugin from 1.9.1 to 7.5.2. Given the widespread use of WordPress and the popularity of this plugin, this vulnerability has the potential to impact a significant number of websites worldwide. The severity of this vulnerability is highlighted by its ability to block administrators from accessing their sites, potentially leading to system compromise or data leakage.
Vulnerability Summary
CVE ID: CVE-2025-3921
Severity: High (8.2 CVSS Score)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Unauthorized access to and modification of user data, potential system compromise and data leakage
Affected Products
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Product | Affected Versions
PeproDev Ultimate Profile Solutions plugin for WordPress | 1.9.1 to 7.5.2
How the Exploit Works
The vulnerability lies in the ‘handel_ajax_req()’ function of the plugin, which lacks a capability check. This allows an unauthenticated attacker to update arbitrary user metadata. The most damaging potential outcome of this is the ability to set ‘wp_capabilities’ to 0, effectively locking an administrator out of their own site.
Conceptual Example Code
Below is a conceptual example of how this vulnerability could be exploited, using a malicious HTTP POST request:
POST /wp-admin/admin-ajax.php?action=peprodev_ultimate_profile_solutions_update HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "user_id": "admin", "meta_key": "wp_capabilities", "meta_value": "0" }In this example, the attacker is setting the ‘wp_capabilities’ of the ‘admin’ user to ‘0’, thereby stripping the administrator of their privileges.
Recommendations for Mitigation
Users are recommended to apply the vendor patch as soon as possible to mitigate this vulnerability. In the interim, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary measures to help guard against potential attacks exploiting this vulnerability. Regularly updating and patching software is a key part of maintaining a robust cybersecurity defense.
