CVE-2024-45510: Synacor Zimbra Collaboration Suite

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

An issue was discovered in Zimbra Collaboration (ZCS) through 10.0. Zimbra Webmail (Modern UI) is vulnerable to a stored Cross-Site Scripting (XSS) attack due to improper sanitization of user input. This allows an attacker to inject malicious code into specific fields of an e-mail message. When the victim adds the attacker to their contacts, the malicious code is stored and executed when viewing the contact list. This can lead to unauthorized actions such as arbitrary mail sending, mailbox exfiltration, profile picture alteration, and other malicious actions. Proper sanitization and escaping of input fields are necessary to mitigate this vulnerability.

Affected products

• Synacor Zimbra Collaboration Suite: before 9.0.0 (fixed in 9.0.0); from 10.0.0, before 10.0.9 (fixed in 10.0.9); version 9.0.0 only

Published 2024-11-20. Last modified 2026-06-17.