CVE-2026-50054

High

Description

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.

SeverityHigh

CVSS7.1

Exploit probability—

Product

Zimbra Collaboration Suite

PublishedOct 8, 2026

First seenOct 8, 2026

Weakness typeCWE-269Improper privilege management

How to fix

Update

Zimbra Zimbra Collaboration Suite10.1.20 or later

Vendor advisories

wiki.zimbra.com/wiki/Zimbra_Security_Advisories

Affected products

Product	Affected versions	Fixed in
Zimbra Zimbra Collaboration Suite	v < 10.1.20	10.1.20

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