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6.4
Advance Block Extend for WordPress allows attackers to inject malicious scripts
CVE-2026-1646
Summary
The Advance Block Extend plugin for WordPress contains a security flaw that allows attackers with Contributor-level access or above to inject malicious scripts on certain pages. This could lead to unauthorized actions, such as data theft or unauthorized changes. Update the plugin to the latest version (1.0.5 or higher) to mitigate this risk.
Original title
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 includin...
Original 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.
nvd CVSS3.1
6.4
Vulnerability type
CWE-79
Cross-site Scripting (XSS)
Published: 19 Feb 2026 · Updated: 11 Mar 2026 · First seen: 6 Mar 2026