PT-2026-35658 · WordPress · Timeline Blocks

Athiwat Tiprasaharn · Published 2026-04-28 · Updated 2026-04-29 · CVE-2026-6551

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Timeline Blocks for Gutenberg versions prior to 1.1.11

Description Stored Cross-Site Scripting occurs due to insufficient input sanitization and output escaping on user-supplied attributes. Authenticated attackers with contributor-level access or higher can inject arbitrary web scripts through the titleTag attribute of the 'timeline-blocks/tb-timeline-blocks' block. These scripts execute whenever a user visits the affected page.

Recommendations Update the plugin to a version later than 1.1.10.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-6551

Affected Products

Timeline Blocks

References · 11

• https://nvd.nist.gov/vuln/detail/CVE-2026-6551 · Security Note
• https://twitter.com/CVEnew/status/2049350453977329884 · Twitter Post
• https://plugins.trac.wordpress.org/browser/timeline-blocks/trunk/src/blocks/index.php#L342 · Note
• https://twitter.com/infoflowcloud/status/2049350825600848015 · Twitter Post
• https://plugins.trac.wordpress.org/browser/timeline-blocks/trunk/src/blocks/index.php#L202 · 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
• https://t.me/cveNotify/161201 · Telegram Post
• 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#L200 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/393d1b30-19f8-454d-84c0-0b539953e1fe?source=cve · Note