CVE-2025-13859 MEDIUM

CVE-2025-13859: AffiliateX 1.0.0 - 1.3.9.3 - Authenticated (Subscriber+) Missing Authorization to Stored Cross-Site Scripting via save_customization_settings

Vendor Wpcenter
Product AffiliateX – Amazon Affiliate Plugin
Weakness CWE-862 · Missing authorization
Published January 15, 2026
Last update January 15, 2026

CVSS base score

6.4/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

What the vulnerability does

01Description

The AffiliateX – Amazon Affiliate Plugin plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the save_customization_settings AJAX action in versions 1.0.0 to 1.3.9.3. This makes it possible for authenticated attackers, with Subscriber-level access and above, to store arbitrary JavaScript that executes whenever an AffiliateX block renders on the site.

Explanation of Vulnerability in Simple Terms

02Summary

AffiliateX – Amazon Affiliate Plugin versions 1.0.0 through 1.3.9.3 lack proper authorization checks, allowing authenticated users with low privileges to access or modify data they should not be able to reach. The vulnerability affects multiple components due to scope change. Site administrators should update to a version newer than 1.3.9.3 as soon as possible.

What an attacker can do

03Attacker Capabilities

Read or modify data belonging to other users or site sections without proper permission.

Potential impact on your site

04Site Impact

Affiliate data, commissions, or user information may be exposed or altered by low-privilege users.

Conditions required to exploit

05Prerequisites

Attacker must have a low-privilege account on the site (e.g., subscriber or contributor role).

Key dates

06Disclosure timeline

January 15, 2026 CVE published
January 15, 2026 Record updated