{"cveID":"CVE-2024-27443","vendorProject":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","vulnerabilityName":"Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability","dateAdded":"2025-05-19","shortDescription":"Zimbra Collaboration contains a cross-site scripting (XSS) vulnerability in the CalendarInvite feature of the Zimbra webmail classic user interface. An attacker can exploit this vulnerability via an email message containing a crafted calendar header, leading to the execution of arbitrary JavaScript code.","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":"2025-06-09","knownRansomwareCampaignUse":"Unknown","notes":"https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P46#Security_Fixes ; https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P39#Security_Fixes ; https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.7#Security_Fixes ; https://nvd.nist.gov/vuln/detail/CVE-2024-27443","cwes":["CWE-79"],"year":2024,"state":"mapped","stale_reasons":[],"mappings":[{"domain":"enterprise","cve":"CVE-2024-27443","technique":"T1566.002","technique_name_at_mapping":"Spearphishing Link","mapping_type":"exploitation_technique","capability_group":"xss","comments":"Attackers can send a malicious email with a specially crafted calendar header in order to execute arbitrary JavaScript code in the browser. This can lead to email collection, which can then be exfiltrated.","references":["https://blackkite.com/blog/focus-friday-tprm-insights-into-zimbra-draytek-vigor-atlassian-jira-data-center-tornado-and-mdaemon-vulnerabilities/"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"},{"domain":"enterprise","cve":"CVE-2024-27443","technique":"T1041","technique_name_at_mapping":"Exfiltration Over C2 Channel","mapping_type":"secondary_impact","capability_group":"xss","comments":"Attackers can send a malicious email with a specially crafted calendar header in order to execute arbitrary JavaScript code in the browser","references":["https://blackkite.com/blog/focus-friday-tprm-insights-into-zimbra-draytek-vigor-atlassian-jira-data-center-tornado-and-mdaemon-vulnerabilities/"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"},{"domain":"enterprise","cve":"CVE-2024-27443","technique":"T1059.004","technique_name_at_mapping":"Unix Shell","mapping_type":"primary_impact","capability_group":"xss","comments":"Attackers can send a malicious email with a specially crafted calendar header in order to execute arbitrary JavaScript code in the browser","references":["https://blackkite.com/blog/focus-friday-tprm-insights-into-zimbra-draytek-vigor-atlassian-jira-data-center-tornado-and-mdaemon-vulnerabilities/"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"},{"domain":"enterprise","cve":"CVE-2024-27443","technique":"T1114","technique_name_at_mapping":"Email Collection","mapping_type":"primary_impact","capability_group":"xss","comments":"Attackers can send a malicious email with a specially crafted calendar header in order to execute arbitrary JavaScript code in the browser","references":["https://blackkite.com/blog/focus-friday-tprm-insights-into-zimbra-draytek-vigor-atlassian-jira-data-center-tornado-and-mdaemon-vulnerabilities/"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"}],"techniques":[{"id":"T1041","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Exfiltration Over C2 Channel","name_at_mapping":"Exfiltration Over C2 Channel","renamed":false,"revoked_by":null,"mapping_types":["secondary_impact"],"sigma_rule_count":5,"has_detection_strategy":true},{"id":"T1059.004","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Unix Shell","name_at_mapping":"Unix Shell","renamed":false,"revoked_by":null,"mapping_types":["primary_impact"],"sigma_rule_count":18,"has_detection_strategy":true},{"id":"T1114","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Email Collection","name_at_mapping":"Email Collection","renamed":false,"revoked_by":null,"mapping_types":["primary_impact"],"sigma_rule_count":4,"has_detection_strategy":true},{"id":"T1566.002","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Spearphishing Link","name_at_mapping":"Spearphishing Link","renamed":false,"revoked_by":null,"mapping_types":["exploitation_technique"],"sigma_rule_count":4,"has_detection_strategy":true}],"mapping_types":["exploitation_technique","primary_impact","secondary_impact"],"has_exploitation_technique":true,"mapping_attack_versions":["16.1"],"mapping_domains":["enterprise"],"sigma_coverage":"full","sigma_rules_tagged_cve":[],"added_after_mapping_snapshot":false,"_source":"kevmap","_built":"2026-08-23 05:47 UTC","_attack_version":"19.2"}