Which Timeline Blocks for Gutenberg versions are affected?

The primary affected range is Versions up to 1.1.10.

How should operators remediate CVE-2026-6551?

Update to 1.1.11 or newer where that release is compatible with the site.

Vulnerability Report

Plugin Medium Patch path listed CVE-2026-6551

Timeline Blocks for Gutenberg <= 1.1.10 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'titleTag' Block Attribute

Q: What is CVE-2026-6551?

CVE-2026-6551 is tracked as a Stored Cross-Site Scripting issue affecting the Plugin Timeline Blocks for Gutenberg.

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.

Quick Answer

CVE-2026-6551 is a medium severity with CVSS 6.4 Stored Cross-Site Scripting issue affecting the Plugin Timeline Blocks for Gutenberg. It affects Versions up to 1.1.10 and is fixed in 1.1.11.

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Published

Apr 27, 2026

Last Updated

Apr 27, 2026

Slug

timeline-blocks

Risk Profile

6.4 CVSS Score

Weakness

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Researchers

Athiwat Tiprasaharn (Jitlada)

Operational Summary

What the operator needs to know

Share Email

Patch Status

Patched release is available

Remediation

Update to version 1.1.11, or a newer patched version

Operator Briefing

CVE-2026-6551 is tracked for the Plugin Timeline Blocks for Gutenberg as medium severity with CVSS 6.4. The affected range is Versions up to 1.1.10. Update Timeline Blocks for Gutenberg to 1.1.11 or newer where that version is compatible with the site.

Issue Type

Stored Cross-Site Scripting

Primary Fixed Version

1.1.11

Primary Affected Range

Versions up to 1.1.10

Tracking ID

CVE-2026-6551

References

https://www.wordfence.com/threat-intel/vulnerabilities/id/393d1b30-19f8-454d-84c0-0b539953e1fe?source=api-prod

Detailed Metadata

Software Type	Plugin
Software Slug	timeline-blocks View on wordpress.org
CVE	CVE-2026-6551
Patched Versions	1.1.11
Affected Versions	Versions up to 1.1.10

Licensing Notices

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DEFIANT

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MITRE

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