{"schema":"threatline.record/2","record":{"id":"CVE-2026-93647","aliases":[],"summary":"Zimbra Collaboration Suite Classic Web Client Stored Cross-Site Scripting via Crafted Calendar COUNTER Message From Address","details":"An unauthenticated calendar sender can place active markup in a COUNTER message's RFC From address. Selecting the message in Zimbra Classic triggers stored XSS, allowing the attacker to access mailbox data and act as the victim.","categories":["Applications & CMS"],"product":"Zimbra Collaboration Suite (ZCS)","vendor":"Zimbra","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93647","source_modified_at":"2026-09-28T12:39:55.319Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"Zimbra Collaboration Suite (ZCS)","vendor":"Zimbra","versions":[{"status":"affected","version":"0","lessThan":"10.1.21","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93647","source_modified_at":"2026-09-28T12:39:55.319Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"Zimbra Collaboration Suite (ZCS)","ecosystem":null},"version":"10.1.21","basis":"first unaffected version stated in the CVE record"}],"cvss":9.3,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.00229,"percentile":0.12971,"score_date":"2026-10-23"},"published_at":"2026-09-25T13:58:05.368Z","modified_at":"2026-09-28T12:39:55.319Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-93647","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-28T12:39:55.319Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-93647","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories","tags":["vendor-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-09-26T03:55:49.181484Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-09-28T12:39:55.319Z","content_hash":"74b436ea6a7f425eb9a85124200f6bd2aedcd267128c2f8b637985d93b40e019"}}