PT-2026-35658 · Techeshta · Timeline Blocks For Gutenberg

Athiwat Tiprasaharn · Published 2026-04-28 · Updated 2026-04-28 · CVE-2026-6551

NVD

CVSS v3.1

6.4

Medium

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-6551

Affected Products

Timeline Blocks For Gutenberg

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2026-6551 · Security Note
• https://plugins.trac.wordpress.org/browser/timeline-blocks/tags/1.1.10/src/blocks/index.php#L343 · Note
• https://plugins.trac.wordpress.org/browser/timeline-blocks/trunk/src/blocks/index.php#L342 · Note
• https://plugins.trac.wordpress.org/browser/timeline-blocks/trunk/src/blocks/index.php#L200 · Note
• https://plugins.trac.wordpress.org/browser/timeline-blocks/trunk/src/blocks/index.php#L202 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/393d1b30-19f8-454d-84c0-0b539953e1fe?source=cve · Note
• https://plugins.trac.wordpress.org/browser/timeline-blocks/trunk/src/blocks/index.php#L343 · Note
• https://plugins.trac.wordpress.org/browser/timeline-blocks/tags/1.1.10/src/blocks/index.php#L202 · Note