Auth bypass in Zimbra Collaboration Suite
CVE-2026-10631
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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-2026-10631?
- CVE-2026-10631 is a medium-severity vulnerability in Zimbra Collaboration Suite, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-10-08.
- How severe is CVE-2026-10631?
- Medium severity. CVSS v3 base score is 6.5 out of 10.