All vulnerabilities
CVE-2026-50054

Zimbra Collaboration Suite GrantRightsRequest SOAP Handler Allows Self-Granting of Undocumented loginAs Mailbox Delegation Right

Zimbra Zimbra Collaboration SuiteApplications & CMS
Open in ThreatlineRecord JSON
CVSS
7.1High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.17%Chance of exploitation activity in the next 30 days, higher than 6% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in10.1.20Fixed versionCVE List
Published8 Oct 2026Updated 8 Oct 2026CVE List

What fixes it

  • 10.1.20Zimbra Collaboration SuiteCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 8 Oct 2026, 16:25 UTCPublishedCVE List
  2. 14 Oct 2026, 13:00 UTCExploit code publicRapid7

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

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.

Text from CVE List

Affected versions 1

  • Zimbra Collaboration Suiteaffected: all versions before 10.1.20CVE List

References 1