Zimbra urges Classic Web Client users to fix a critical XSS bug
Source headline: Zimbra urges customers to patch critical web client XSS flaw
Intelligence Summary
Zimbra has highlighted a critical cross-site scripting (XSS) flaw in its Classic Web Client. The issue impacts users accessing the Zimbra Collaboration suite through that web client. Zimbra recommends customers apply the appropriate patches as soon as possible. Successful exploitation could allow attackers to inject and execute malicious scripts in a victim’s browser session. Organizations using the Classic Web Client should verify their versions and remediate immediately to reduce exposure.
Recommended Action
Inventory where Classic Web Client runs in your environment and treat this as an active remediation item. Until then, watch authentication and outbound traffic logs for the indicators described in the source. This signal rests on a single report, so corroborate it before acting on anything irreversible.