CVE-2021-28002: Textpattern

Medium severity, CVSS 5.4. EPSS: 1.1% chance of exploitation in the next 30 days.

A persistent cross-site scripting vulnerability was discovered in the Excerpt parameter in Textpattern CMS 4.9.0 which allows remote attackers to execute arbitrary code via a crafted payload entered into the URL field. The vulnerability is triggered by users visiting the 'Articles' page.

Affected products

• Textpattern Textpattern: version 4.9.0 only

Published 2021-08-19. Last modified 2026-06-17.