CVE-2026-6551

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

CVSS 6.4 MEDIUMEPSS 0.2%CWE-79

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.4EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

28 Apr 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

techeshta · Timeline Blocks for Gutenberg

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References

https://plugins.trac.wordpress.org/browser/timeline-blocks/tags/1.1.10/src/blocks/index.php#L202 https://plugins.trac.wordpress.org/browser/timeline-blocks/tags/1.1.10/src/blocks/index.php#L343 https://plugins.trac.wordpress.org/browser/timeline-blocks/trunk/src/blocks/index.php#L200 https://plugins.trac.wordpress.org/browser/timeline-blocks/trunk/src/blocks/index.php#L202 https://plugins.trac.wordpress.org/browser/timeline-blocks/trunk/src/blocks/index.php#L342 https://plugins.trac.wordpress.org/browser/timeline-blocks/trunk/src/blocks/index.php#L343 https://www.wordfence.com/threat-intel/vulnerabilities/id/393d1b30-19f8-454d-84c0-0b539953e1fe?source=cve