What the vulnerability does
01Description
The GZSEO plugin for WordPress is vulnerable to authorization bypass leading to Stored Cross-Site Scripting in all versions up to, and including, 2.0.11. This is due to missing capability checks on multiple AJAX handlers combined with insufficient input sanitization and output escaping on the embed_code parameter. This makes it possible for authenticated attackers, with contributor level access and above, to inject arbitrary content into any post on the site that will execute whenever a user accesses an injected page.
Explanation of Vulnerability in Simple Terms
02Summary
GZSEO versions up to 2.0.11 contain a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts affecting other users. The vulnerability has a changed scope, meaning the impact extends beyond the vulnerable component itself. Site administrators should update to version 2.0.12 or later to remediate this issue.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers and affect site functionality.
Potential impact on your site
04Site Impact
Authenticated users can inject scripts affecting other visitors; update GZSEO immediately to prevent account compromise or data theft.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege account (e.g., subscriber or contributor role) on the site.
Key dates
06Disclosure timeline
January 24, 2026
CVE published
April 8, 2026
Record updated
