Timeline Blocks for Gutenberg, CVE-2026-6551

CVE, Research URL: CVE-2026-6551
Home page URL: Security reports for Timeline Blocks for Gutenberg
Application: Timeline Blocks for Gutenberg
Published on: Apr 28, 2026
Research Description: 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.
Affected versions: max 1.1.11.
Status: vulnerable