{"cveID":"CVE-2025-27915","vendorProject":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability","dateAdded":"2025-10-07","shortDescription":"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.","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.","dueDate":"2025-10-28","knownRansomwareCampaignUse":"Unknown","notes":"https://wiki.zimbra.com/wiki/Security_Center ; https://nvd.nist.gov/vuln/detail/CVE-2025-27915","cwes":["CWE-79"],"year":2025,"state":"unmapped","stale_reasons":[],"mappings":[],"techniques":[],"mapping_types":[],"has_exploitation_technique":false,"mapping_attack_versions":[],"mapping_domains":[],"sigma_coverage":null,"sigma_rules_tagged_cve":[],"added_after_mapping_snapshot":true,"_source":"kevmap","_built":"2026-08-23 05:47 UTC","_attack_version":"19.2"}