{"schema":"threatline.record/2","record":{"id":"CVE-2026-93631","aliases":[],"summary":"Zimbra Collaboration Suite OAuth Extension Cross-Site Request Forgery Enables Account Linking","details":"A cross-site request forgery vulnerability in the OAuth extension of Zimbra Collaboration Suite (ZCS) Network Edition allows an attacker to link an attacker-controlled external account to a victim's mailbox. The OAuth callback does not bind its state value or authorization code to the initiating Zimbra session and instead selects the destination mailbox from the browser's current authentication cookie. On a deployment with the provider configured, an attacker can induce a signed-in victim to load a callback containing a fresh code for the attacker's provider account. This creates a persistent data source that imports attacker-controlled contacts or events. With bidirectional CalDAV synchronization, appointments subsequently created or edited in the linked calendar are also disclosed to the attacker. 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-2026-93631","source_modified_at":"2026-10-23T13:23:34.952Z","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":7.1,"severity":"High","kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-23T13:23:34.952Z","modified_at":"2026-10-23T13:23:34.952Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-93631","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T13:23:34.952Z"}],"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":"2026-10-23T13:23:34.952Z","content_hash":"7b56bef549a179d830c89928feade1c7cf4d077041a9794b308ea0e8f7b35ba1"}}