CVE-2012-5805: PayPal Instant Payment Notification

Medium severity, CVSS 5.8. EPSS: 0.6% chance of exploitation in the next 30 days.

The PayPal IPN functionality in Zen Cart does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate, a different vulnerability than CVE-2012-5806.

Affected products

• PayPal Instant Payment Notification: affected versions not specified
• Zen-Cart Zen Cart: affected versions not specified

Published 2012-11-04. Last modified 2026-06-16.