CVE-2026-10631: Zimbra Collaboration Suite

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

An authorization bypass in the EWS FindItem handler of Zimbra Collaboration Suite 10.1.0 through 10.1.19 allows an authenticated user with EWS enabled to read complete mailbox items, including raw MIME and attachments, from arbitrary local accounts without a share or delegation grant.

Affected products

• Zimbra Zimbra Collaboration Suite: before 10.1.20 (fixed in 10.1.20)

Published 2026-10-08. Last modified 2026-10-08.