Privilege escalation in Zimbra Collaboration Suite
CVE-2026-50054
An authorization flaw in Zimbra Collaboration Suite’s GrantRightsRequest allows an attacker with access to an authenticated account to grant another local account the loginAs right, creating persistent mailbox access and mail-sending authority that survives password changes and session expiry.
Vulnerability class: Privilege Escalation
Published .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- wiki.zimbra.com/wiki/Zimbra_Security_Advisories (vendor-advisory)
Frequently asked questions
- What is CVE-2026-50054?
- CVE-2026-50054 is a high-severity vulnerability in Zimbra Collaboration Suite, classified under Improper Privilege Management. CVSS score: 7.1/10. Published 2026-10-08.
- How severe is CVE-2026-50054?
- High severity. CVSS v3 base score is 7.1 out of 10.