{"id":"CVE-2026-93639","aliases":[],"title":"Zimbra Collaboration Suite Missing Authorization in ConfigureZimlet Enables Delegated Administrator Privilege Escalation","titleSource":"rapid7","descriptionSource":"rapid7","products":[{"vendor":"Zimbra","name":"Zimbra Collaboration Suite","platforms":[],"versions":[{"version":"0","status":"affected","lessThanOrEqual":"10.1.20","versionType":"semver"}],"defaultStatus":"unaffected","source":"rapid7","url":"https://www.cve.org/CVERecord?id=CVE-2026-93639"}],"remediation":[],"description":"A missing authorization vulnerability in Zimbra Collaboration Suite (ZCS) allows a delegated administrator with no explicit administrative grants to overwrite global Zimlet configuration through ConfigureZimletRequest. The uploaded configuration can also add an attacker-controlled domain to the proxy allowlist of the default class of service. If a signed-in user in that class opens a crafted /service/proxy URL, Zimbra serves attacker-controlled HTML under its own origin. The resulting JavaScript can read mailbox data and perform authenticated actions as the victim. Exploitation requires a delegated-administrator account and access to the admin SOAP service; the browser compromise additionally requires the victim to open the crafted URL. ZCS 10.1.16 and 10.1.20 are affected.","severity":"high","score":8.7,"published":"2026-10-23T13:29:25.939Z","modified":"2026-10-28T19:49:41.321Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories","https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/"],"sources":[{"name":"CVE","id":"CVE-2026-93639","modified":"2026-10-28T19:49:41.321Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-93639"}],"assessments":[{"source":"rapid7","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","score":8.7}],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-29T03:20:31.263Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}