Advance Block Extend <= 1.0.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via TitleColor Block Attribute

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2026-1646
CVSS Medium (6.4)
Publicly Published February 18, 2026
Last Updated February 19, 2026
Researcher Athiwat Tiprasaharn (Jitlada), Itthidej Aramsri (Boeing777), Vilaysone CHANTHAVONG (0xJ0cKkY)
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.

References

1 affected software package

Software Type Plugin
Software Slug advance-block-extend (view on wordpress.org)
Patched? No
Affected Version
  • <= 1.0.4
Patched Version
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