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Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that could allow attackers to execute arbitrary JavaScript within the user's session, potentially leading to unauthorized access to sensitive information.
CISA lists CVE-2025-48700 as known exploited in the wild for Synacor Zimbra Collaboration Suite (ZCS). Ransomware campaign use: Unknown. Federal remediation due date: 2026-04-23.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.