{"cve_id":"CVE-2025-27915","published":"2025-03-12T15:15:39.900000+00:00","last_modified":"2026-06-17T09:04:22.957000+00:00","vuln_status":"Analyzed","description":"An issue was discovered in Zimbra Collaboration (ZCS) 9.0 and 10.0 and 10.1. A stored cross-site scripting (XSS) vulnerability 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 <details> 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.","cvss_version":"3.1","cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","base_score":5.4,"base_severity":"MEDIUM","attack_vector":"NETWORK","privileges_req":"LOW","user_interaction":"REQUIRED","scope":"CHANGED","impact_c":"LOW","impact_i":"LOW","impact_a":"NONE","cwe_ids":["CWE-79"],"in_kev":true,"kev_date_added":"2025-10-07","kev_ransomware":false,"epss_score":0.04064,"epss_percentile":0.90667,"cap_rule_version":"0.1.1","stage":"CRED_ACCESS","req_access":"USER","req_vector":"NETWORK","req_user_interaction":true,"grant_access":"USER","caps":["CRED_ACCESS","INFO_DISCLOSURE","TAMPER"],"terminal":false,"cap_confidence":"high","ingested_at":"2026-09-18T11:29:53.785920+00:00","first_seen":"2025-03-12T15:15:39.900000+00:00","kev_first_seen":"2025-10-07T00:00:00+00:00","novelty_score":0.0,"novelty_reasons":[],"novelty_at":null,"vendors":["synacor"],"products":["zimbra_collaboration_suite"],"affected":[{"vendor":"synacor","product":"zimbra_collaboration_suite","ranges":["≥ 10.0.0 and < 10.0.13","≥ 10.1.0 and < 10.1.5","9.0.0"]}]}