Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability
- When
- · day precision
- Where
- Global (internet)
- Category
- cyber_exploit
Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that exists in the Classic Web Client due to insufficient sanitization of HTML content in ICS files. When a user views an e-mail message containing a malicious ICS entry, its embedded JavaScript executes via an ontoggle event inside a tag. This allows an attacker to run arbitrary JavaScript within the victim's session, potentially leading to unauthorized actions such as setting e-mail filters to redirect messages to an attacker-controlled address. As a result, an attacker can perform unauthorized actions on the victim's account, including e-mail redirection and data exfiltration.
Sources
- CISA ↗ · first seen 2025-10-07 00:00 UTC
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