CVE-2018-19131: Squid-Cache Squid

Medium severity, CVSS 6.1. EPSS: 3.3% chance of exploitation in the next 30 days.

Squid before 4.4 has XSS via a crafted X.509 certificate during HTTP(S) error page generation for certificate errors.

Affected products

• Squid-Cache Squid: before 4.4 (fixed in 4.4)

Published 2018-11-09. Last modified 2026-06-17.