CVE-2010-4555: Squirrelmail

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

Multiple cross-site scripting (XSS) vulnerabilities in SquirrelMail 1.4.21 and earlier allow remote attackers to inject arbitrary web script or HTML via vectors involving (1) drop-down selection lists, (2) the > (greater than) character in the SquirrelSpell spellchecking plugin, and (3) errors associated with the Index Order (aka options_order) page.

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.