PT-2026-20638 · WordPress · Advance Block Extend

Athiwat Tiprasaharn + 2 · Published 2026-02-19 · Updated 2026-02-23 · CVE-2026-1646

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Advance Block Extend plugin for WordPress versions through 1.0.4

Description The Advance Block Extend plugin for WordPress has a Stored Cross-Site Scripting issue. This is due to insufficient input sanitization and output escaping in the TitleColor block attribute within the Latest Posts Gutenberg block. Authenticated attackers with Contributor-level access or higher can inject arbitrary web scripts into pages. These scripts will execute when a user accesses the affected page.

Recommendations Update the Advance Block Extend plugin to a version later than 1.0.4.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-1646

Affected Products

Advance Block Extend

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-1646 · Security Note
• https://plugins.trac.wordpress.org/browser/advance-block-extend/tags/1.0.4/gutenberg-block.php#L118 · Note
• https://plugins.trac.wordpress.org/browser/advance-block-extend/trunk/gutenberg-block.php#L118 · Note
• https://twitter.com/CVEnew/status/2025892076789842101 · Twitter Post
• https://wordfence.com/threat-intel/vulnerabilities/id/3218716a-cce6-4ce7-a6be-4e146e0a6d53?source=cve · Note