What the vulnerability does
01Description
The EG-Series plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's [series] shortcode in all versions up to, and including, 2.1.1 due to insufficient input sanitization and output escaping on user supplied attributes in the shortcode_title function. This makes it possible for authenticated attackers - with contributor-level access and above, on sites with the Classic Editor plugin activated - to inject arbitrary JavaScript code in the titletag attribute that will execute whenever a user access an injected page.
Explanation of Vulnerability in Simple Terms
02Summary
EG-Series versions 2.1.1 and earlier contain a cross-site scripting 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. Low-privileged accounts can exploit this without user interaction to read or modify sensitive data.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that affect other users' sessions and data.
Potential impact on your site
04Site Impact
Authenticated users can inject scripts affecting other users' data and sessions.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privileged account; no user interaction required.
Key dates
06Disclosure timeline
May 15, 2025
CVE published
April 8, 2026
Record updated
