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Description

The Advance Block Extend plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the TitleColor block attribute in the Latest Posts Gutenberg block in all versions up to, and including, 1.0.4 due to insufficient input sanitization and output escaping. 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 2026-01-29 | Published 2026-02-19 | Updated 2026-02-19 | Assigner Wordfence




MEDIUM: 6.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Problem types

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

Product status

Default status
unaffected

* (semver)
affected

Timeline

2026-02-18:Disclosed

Credits

Athiwat Tiprasaharn finder

Itthidej Aramsri finder

Vilaysone CHANTHAVONG finder

References

www.wordfence.com/...-cce6-4ce7-a6be-4e146e0a6d53?source=cve

plugins.trac.wordpress.org/...tend/trunk/gutenberg-block.php

plugins.trac.wordpress.org/...tags/1.0.4/gutenberg-block.php

cve.org (CVE-2026-1646)

nvd.nist.gov (CVE-2026-1646)

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