What’s Vulnerable › Vulnerabilities
CVE-2026-10631: Zimbra Collaboration Suite EWS Extension Authorization Bypass via Crafted Composite Folder/Item Identifier
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-08 · updated 2026-10-08
- Weakness: CWE-639
Description
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 Collaboration: before 10.1.20 — fixed in 10.1.20
How to fix
Upgrade to a fixed version: Zimbra Collaboration 10.1.20. Check the vendor advisory for mitigations.
In the news
References
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