What the vulnerability does
01Description
The Stop Spammers Classic plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2026.1. This is due to missing nonce validation in the ss_addtoallowlist class. This makes it possible for unauthenticated attackers to add arbitrary email addresses to the spam allowlist via a forged request granted they can trick a site administrator into performing an action such as clicking on a link. The vulnerability was partially patched in version 2026.1.
Explanation of Vulnerability in Simple Terms
02Summary
Stop Spammers Classic versions up to 2026.1 are vulnerable to cross-site request forgery (CSRF) attacks. An attacker can craft a malicious webpage that, when visited by a logged-in site administrator, performs unwanted actions on the site without the admin's knowledge or consent. The vulnerability requires the victim to visit a malicious link or page while authenticated.
What an attacker can do
03Attacker Capabilities
Perform unwanted actions on the site by tricking an authenticated admin into visiting a malicious webpage.
Potential impact on your site
04Site Impact
An attacker can modify site settings or data by exploiting an admin's active session without their awareness.
Conditions required to exploit
05Prerequisites
Site admin must be logged in and visit an attacker-controlled webpage or link.
Key dates
06Disclosure timeline
January 28, 2026
CVE published
April 8, 2026
Record updated
