What the vulnerability does
01Description
The hk_shortcode plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'title-plane' shortcode in versions up to, and including, 1.0. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes in the huankong_post_short_title_plane() function, where the 'title' attribute is concatenated directly into HTML output without any escaping. 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
HK Shortcode versions 1.0 and earlier contain a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts affecting other users. The vulnerability exists because user input is not properly sanitized before being displayed. An attacker with low-level account access can craft malicious content that executes in other users' browsers when they view affected pages.
What an attacker can do
03Attacker Capabilities
Inject JavaScript that runs in other users' browsers, potentially stealing session tokens or performing actions on their behalf.
Potential impact on your site
04Site Impact
Authenticated users can inject malicious scripts affecting other site visitors, risking credential theft and unauthorized actions.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege account on the site; no user interaction required from the victim.
Key dates
06Disclosure timeline
May 27, 2026
CVE published
May 27, 2026
Record updated
