{"schema":"threatline.record/2","record":{"id":"CVE-2026-93634","aliases":[],"summary":"Zimbra Collaboration Suite Cross-Account Authorization Bypass via Forged Shared-File Records","details":"A cross-account authorization vulnerability in Zimbra Collaboration Suite (ZCS) allows an authenticated user to insert forged shared-file records into another user's mailbox through FileSharedWithMeRequest. The request bypasses delegated-account authorization and accepts attacker-selected file metadata, owner identifiers and declared sizes without validating a corresponding document share. An attacker can plant entries attributed to another real local account without that account sharing a document. No victim interaction is required. ZCS 10.1.16 and 10.1.20 are affected.","categories":["Applications & CMS"],"product":"Zimbra Collaboration Suite","vendor":"Zimbra","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93634","source_modified_at":"2026-10-23T13:26:11.070Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Zimbra Collaboration Suite","vendor":"Zimbra","versions":[{"status":"affected","version":"0","lessThanOrEqual":"10.1.20","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":4.3,"severity":"Medium","kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-23T13:26:11.070Z","modified_at":"2026-10-23T13:26:11.070Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-93634","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T13:26:11.070Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/","tags":["related"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-23T13:26:11.070Z","content_hash":"e7929d8ab295f5ee2bc8e3c207d691256c26df1854dc2e3340297810d3bd373c"}}