MSRXCVE-2026-50056
CVE-2026-50056
Zimbra Collaboration Suite Local Privilege Escalation via zmmailboxdmgr JVM Argument Injection
CVSS 3.1 · CNA
chance of exploitation in the next 30 days (EPSS; higher than 27% of CVEs)
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.
Scores
Affected products
- Zimbra Zimbra Collaboration Suite: 0 to ≤ 10.1.21
Weakness: CWE-88
2 references (advisories, patches, write-ups)
Sources: CVE.org, FIRST EPSS. Missing ones did not answer or have no record yet.