Over 10,000 Zimbra servers vulnerable to ongoing XSS attacks
Summary
Over 10,000 Zimbra Collaboration Suite instances are vulnerable to ongoing cross-site scripting (XSS) attacks. Attackers can exploit this flaw to steal session cookies and potentially hijack user accounts. The vulnerability affects multiple versions of Zimbra Collaboration Suite.
IFF Assessment
This is bad news for defenders as an unpatched vulnerability is actively being exploited, allowing attackers to compromise user accounts.
Severity
The CVSS score of 6.1 reflects a Medium severity for this XSS vulnerability. While it doesn't allow remote code execution, it can lead to account takeover via session hijacking, which is a significant impact on user data and system integrity.
Defender Context
Organizations using Zimbra Collaboration Suite must prioritize patching this XSS vulnerability to prevent ongoing attacks. Defenders should monitor network traffic for signs of session cookie exfiltration and educate users about phishing attempts that could leverage compromised accounts.