From One Account to Every Mailbox: Breaking Zimbra's Identity Boundaries (Part 1)
Rapid7 details dozens of Zimbra flaws, including mailbox impersonation and cross-user access, with some fixes still missing.
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CVE-2026-73571
- CVSS 3.1
- 4.3 medium
- EPSS
- <1%p5
- Published
- ·
- Modified
Description · NVD
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.
- Vendors
- synacor
- Products
- zimbra collaboration suite
- Weakness
- CWE-863
- Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N