CVE-2026-73571
Low
Description
An authorization bypass vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.17 due to improper authorization validation in delegated email sending functionality. An authenticated attacker can send specially crafted SOAP requests to impersonate another user and send emails without possessing the required delegation or send-as permissions. This occurs in the SaveDraftRequest SOAP handler.
SeverityLow
CVSS3.1
Exploit probability—
Product
Synacor Zimbra Collaboration Suite
PublishedAug 13, 2026
First seenAug 13, 2026
Weakness typeCWE-863Incorrect authorization
How to fix
Update
- synacor zimbra_collaboration_suite10.1.17 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| synacor zimbra_collaboration_suite | v < 10.1.17 | 10.1.17 |
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