What the vulnerability does
01Description
The Advance Block Extend plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the TitleColor block attribute in the Latest Posts Gutenberg block in all versions up to, and including, 1.0.4 due to insufficient input sanitization and output 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
Advance Block Extend versions 1.0.4 and earlier contain a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts. The vulnerability has a changed scope, meaning the impact can extend beyond the vulnerable component itself. An attacker with low-level privileges can inject code that affects other users or site functionality.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers or affect site functionality.
Potential impact on your site
04Site Impact
Authenticated users can inject scripts affecting other visitors or site behavior; data theft or malware distribution possible.
Conditions required to exploit
05Prerequisites
Attacker must have a low-level user account on the site; no user interaction required.
Key dates
06Disclosure timeline
February 19, 2026
CVE published
April 8, 2026
Record updated
