What the vulnerability does
01Description
The Tuxquote plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'TUXQUOTE' shortcode in versions up to, and including, 1.3. This is due to insufficient input sanitization and output escaping on user supplied attributes ('title', 'align', and 'width') in the tuxquote_build_format() function, which are concatenated into the rendered HTML without being passed through esc_attr() or esc_html(). 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
Tuxquote versions 1.3 and earlier contain a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts affecting other users. The vulnerability has scope change, meaning the impact extends beyond the vulnerable component itself. Low-privileged accounts can exploit this without user interaction.
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 low-privileged account on the site; no user interaction required from victims.
Key dates
06Disclosure timeline
May 27, 2026
CVE published
May 27, 2026
Record updated
