What the vulnerability does
01Description
The Timeline Blocks for Gutenberg plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'titleTag' attribute of the timeline-blocks/tb-timeline-blocks block in all versions up to, and including, 1.1.10 due to insufficient input sanitization and output escaping on user supplied attributes. 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
Timeline Blocks for Gutenberg versions up to 1.1.10 contain a cross-site scripting vulnerability that allows authenticated users to inject malicious scripts. The vulnerability affects the block editor and can impact other users viewing the site. A logged-in attacker with low privileges can inject code that executes in visitors' browsers, potentially stealing data or performing actions on their behalf.
What an attacker can do
03Attacker Capabilities
Inject malicious JavaScript that runs in other users' browsers when they view affected pages.
Potential impact on your site
04Site Impact
Visitors and other users may have their sessions compromised or data stolen through injected scripts.
Conditions required to exploit
05Prerequisites
Attacker must be logged in with at least low-level WordPress user privileges.
Key dates
06Disclosure timeline
April 28, 2026
CVE published
April 28, 2026
Record updated
