CVE-2026-6551

Description

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.

PUBLISHED Reserved 2026-04-17 | Published 2026-04-28 | Updated 2026-04-28 | Assigner Wordfence

Problem types

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

Timeline

Credits

Athiwat Tiprasaharn finder

References

www.wordfence.com/...-19f8-454d-84c0-0b539953e1fe?source=cve

plugins.trac.wordpress.org/...gs/1.1.10/src/blocks/index.php

plugins.trac.wordpress.org/...gs/1.1.10/src/blocks/index.php

plugins.trac.wordpress.org/...cks/trunk/src/blocks/index.php

plugins.trac.wordpress.org/...cks/trunk/src/blocks/index.php

plugins.trac.wordpress.org/...cks/trunk/src/blocks/index.php

plugins.trac.wordpress.org/...cks/trunk/src/blocks/index.php

cve.org (CVE-2026-6551)

nvd.nist.gov (CVE-2026-6551)

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