CVE-2011-2023: Squirrelmail

Medium severity, CVSS 4.3. EPSS: 2.3% chance of exploitation in the next 30 days.

Cross-site scripting (XSS) vulnerability in functions/mime.php in SquirrelMail before 1.4.22 allows remote attackers to inject arbitrary web script or HTML via a crafted STYLE element in an e-mail message.

Affected products

• Squirrelmail Squirrelmail: up to and including 1.4.21; version 0.1 only; version 0.1.1 only; version 0.1.2 only; version 0.2 only; version 0.2.1 only; …

Published 2011-07-14. Last modified 2026-06-16.