Stored Cross-Site Scripting in Timeline Blocks for Gutenberg Plugin by WordPress
CVE-2026-6551

6.4MEDIUM

Key Information:

Vendor

WordPress
Status
Timeline Blocks For Gutenberg
Vendor
CVE Published:
28 April 2026

What is CVE-2026-6551?

The Timeline Blocks for Gutenberg plugin for WordPress is susceptible to Stored Cross-Site Scripting (XSS) through the 'titleTag' attribute in the timeline-blocks/tb-timeline-blocks block. This vulnerability arises from inadequate input sanitization and output escaping of user-supplied data, affecting all versions up to and including 1.1.10. Authenticated attackers with contributor-level access and above can exploit this flaw to inject arbitrary web scripts into pages, leading to potential execution of these scripts whenever the compromised page is accessed by users.

Affected Version(s)

Timeline Blocks for Gutenberg 0 <= 1.1.10

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/timeline-block...
https://plugins.trac.wordpress.org/browser/timeline-block...

CVSS V3.1

Score:
6.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Athiwat Tiprasaharn
.