{"id":"CVE-2022-27926","published":"2022-04-21T00:15:08Z","modified":"2026-06-17T04:37:45Z","title":"Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability","vendor":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","tier":"core","eol":null,"description":{"text":"A reflected cross-site scripting (XSS) vulnerability in the /public/launchNewWindow.jsp component of Zimbra Collaboration (aka ZCS) 9.0 allows unauthenticated attackers to execute arbitrary web script or HTML via request parameters.","provenance":"source","from":"NVD"},"summary":{"text":"A reflected cross-site scripting flaw exists in the /public/launchNewWindow.jsp component of Synacor's Zimbra Collaboration Suite (ZCS) 9.0. An unauthenticated attacker can execute arbitrary web script or HTML through request parameters, and the attack requires a user to interact with a crafted link or page.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T13:44:26Z"},"cvss":{"score":6.1,"severity":"MEDIUM","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","provenance":"source","from":"NVD"},"epss":{"score":0.17634,"percentile":0.97142,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2023-04-03","dueDate":"2023-04-24","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://wiki.zimbra.com/wiki/Security_Center;  https://nvd.nist.gov/vuln/detail/CVE-2022-27926","provenance":"source"},"vulncheckKev":{"dateAdded":"2023-03-30","exploitedFirstSeen":"2023-03-30","ransomware":false,"evidence":[{"url":"https://www.proofpoint.com/us/blog/threat-insight/exploitation-dish-best-served-cold-winter-vivern-uses-known-zimbra-vulnerability","date":"2023-03-30"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2023-04-03"},{"url":"https://www.welivesecurity.com/wp-content/uploads/2023/05/eset_apt_activity_report_q42022_q12023.pdf","date":"2023-05-09"},{"url":"https://www.welivesecurity.com/en/eset-research/moustachedbouncer-espionage-against-foreign-diplomats-in-belarus/","date":"2023-08-10"},{"url":"https://information.rapid7.com/rs/411-NAK-970/images/Rapid7-2023-Mid-Year-Threat-Review.pdf","date":"2023-08-17"},{"url":"https://go.recordedfuture.com/hubfs/reports/cta-2024-0217.pdf","date":"2024-02-17"},{"url":"https://www.verizon.com/business/resources/T600/reports/2024-dbir-data-breach-investigations-report.pdf","date":"2024-05-01"},{"url":"https://app.crowdsec.net/cti/cve-explorer/CVE-2022-27926","date":"2025-06-12"},{"url":"https://www.crowdsec.net/vulntracking-report/zimbra-collaboration-coordinated-attack","date":"2026-02-02"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-09-21&host_type=src&vulnerability=cve-2022-27926","date":"2026-09-21"}],"evidenceTotal":18,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"},{"id":"CWE-138","name":"Improper Neutralization of Special Elements"}],"references":[{"url":"https://wiki.zimbra.com/wiki/Security_Center","tags":["Vendor Advisory"]},{"url":"https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P24","tags":["Release Notes","Vendor Advisory"]},{"url":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories","tags":["Vendor Advisory"]},{"url":"https://wiki.zimbra.com/wiki/Security_Center","tags":["Vendor Advisory"]},{"url":"https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P24","tags":["Release Notes","Vendor Advisory"]},{"url":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-27926","tags":["US Government Resource"]}],"techniques":[{"id":"T1189","name":"Drive-by Compromise","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Victim visits crafted link; drive-by script delivery","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"reflected cross-site scripting (XSS) vulnerability in the /public/launchNewWindow.jsp component","start":2,"end":97}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1059.007","name":"JavaScript","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Injected JavaScript executes in victim's browser","mappingType":"primary_impact","evidence":[{"from":"description","quote":"allows unauthenticated attackers to execute arbitrary web script or HTML","start":136,"end":208}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[{"id":"SRC-c3138c42304530162a54","title":"MoustachedBouncer: Espionage against foreign diplomats in Belarus","publisher":"welivesecurity.com","url":"https://www.welivesecurity.com/es/investigaciones/espionaje-diplomaticos-extranjeros-bielorrusia/","date":null,"mentions":[{"quote":"En marzo de 2023, Winter Vivern había usado una vulnerabilidad XSS (CVE-2022-27926) en el portal de mail Zimbra para robar credenciales de webmails de diplomáticos de varios países europeos.","start":2955,"end":3145}]}],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2022-32414","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-32414","exploited":true,"exploitedSince":"2023-04-03","provenance":"source"},"exploits":[],"exploitSources":{"nuclei":[{"id":"CVE-2022-27926","name":"Zimbra Collaboration (ZCS) - Cross Site Scripting","severity":"medium","path":"http/cves/2022/CVE-2022-27926.yaml","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2022/CVE-2022-27926.yaml"}],"provenance":"source"},"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1189"],"provenance":"ai"},{"stage":"primary","techniques":["T1059.007"],"provenance":"ai"}],"timeline":[{"date":"2022-04-21","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-27926","provenance":"source"},{"date":"2023-03-30","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://www.proofpoint.com/us/blog/threat-insight/exploitation-dish-best-served-cold-winter-vivern-uses-known-zimbra-vulnerability","provenance":"source"},{"date":"2023-04-03","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2023-04-03","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-32414","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":347},"priority":{"score":70.6,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 1309 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.43,"detail":"percentile 0.9714"},{"name":"Named in threat reports","points":3.87,"detail":"1 report"},{"name":"Public exploit code","points":5.0,"detail":"1 nuclei template"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":4.27,"detail":"base score 6.1"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"familyId":"fam-class-synacor-zimbra-collaboration-suite-zcs-cwe-79"}}