{"cvss":0.0,"datePublished":"2025-09-30T00:00:00Z","dateUpdated":"2025-09-30T00:00:00Z","description":"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.","dueDate":"2025-10-28T00:00:00Z","id":"CVE-2025-27915","kev_catalogs":["vulncheck"],"knownRansomwareCampaignUse":"Unknown","product":"Zimbra Collaboration Suite (ZCS)","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","severity":"HIGH","source":"vulncheck_kev","title":"Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability","vendor":"Synacor"}