What the vulnerability does
01Description
The Investi plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'investi-announcements-accordion' shortcode's 'maximum-num-years' attribute in all versions up to, and including, 1.0.26. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes. Specifically, the 'maximum-num-years' attribute value is read directly from shortcode attributes and interpolated into a double-quoted HTML attribute without any escaping (no esc_attr(), htmlspecialchars(), or similar). This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Explanation of Vulnerability in Simple Terms
02Summary
Investi versions 1.0.26 and earlier 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. Users should update to version 1.0.27 or later to remediate this issue.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers and affect the application's functionality.
Potential impact on your site
04Site Impact
Authenticated users can inject scripts affecting other users' sessions and data integrity across the application.
Conditions required to exploit
05Prerequisites
Attacker must have a valid user account with low-level privileges; no user interaction required from victims.
Key dates
06Disclosure timeline
April 8, 2026
CVE published
April 8, 2026
Record updated
