CVE-2023-24030: Zimbra Collaboration

Medium severity, CVSS 6.1. EPSS: 0.4% chance of exploitation in the next 30 days.

An open redirect vulnerability exists in the /preauth Servlet in Zimbra Collaboration Suite through 9.0 and 8.8.15. To exploit the vulnerability, an attacker would need to have obtained a valid zimbra auth token or a valid preauth token. Once the token is obtained, an attacker could redirect a user to any URL if url sanitisation is bypassed in incoming requests. NOTE: this is similar, but not identical, to CVE-2021-34807.

Affected products

• Zimbra Collaboration: version 8.8.15 only; version 9.0.0 only

Published 2023-06-15. Last modified 2026-06-17.