{"id":"CVE-2026-50056","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-50056","generatedAt":"2026-10-28T02:21:51.980Z","title":"A local privilege escalation vulnerability in the zmmailboxdmgr launcher of Zimbra Collaboration Suite (ZCS) allows the Unix zimbra account to execute arbitrary commands as root.","description":"A local privilege escalation vulnerability in the zmmailboxdmgr launcher of Zimbra Collaboration Suite (ZCS) allows the Unix zimbra account to execute arbitrary commands as root. The passwordless sudo interface accepts JVM arguments that are not adequately restricted. An attacker can postpone Jetty's privilege drop, register an OnOutOfMemoryError command and force heap exhaustion during startup, causing the command to execute while the JVM still runs as root. Exploitation requires local command execution as zimbra on a mailbox server and interrupts mailboxd during the malicious restart. ZCS 10.1.16 and 10.1.21 are affected.","published":"2026-10-23T14:17:53.000Z","lastModified":"2026-10-24T04:18:18.000Z","status":"Undergoing Analysis","sourceIdentifier":"cve@rapid7.com","cvss":{"version":"3.1","score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-88"],"affected":[],"epss":{"score":0.00344,"percentile":0.27662,"date":"2026-10-26","history":[{"date":"2026-10-24","score":0.00216,"percentile":0.11465}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.34%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-23T14:17:53.000Z","detail":{"score":"7.8","severity":"HIGH","publishedAt":"2026-10-23T14:17:53.187Z"},"summary":"New CVE, high severity (CVSS 7.8)."}],"references":[{"url":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories","source":"cve@rapid7.com"},{"url":"https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/","source":"cve@rapid7.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-50056","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}