CVE-2026-50055
Zimbra Collaboration Suite Sieve Notify Filter Action Bypasses Mail Forwarding Restriction via Variable Expansion
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
A policy-enforcement flaw in Zimbra Collaboration Suite allows an authenticated user to bypass disabled mail forwarding by using a Sieve notify action to send copies of email content and headers to an arbitrary address.
| CWE | CWE-863 |
| Vendor | zimbra |
| Product | zimbra collaboration suite |
| Published | Oct 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
Zimbra / Zimbra Collaboration Suite
0 < 10.1.20
References
Credits
Jonah Burgess (CryptoCat), Senior Security Researcher, Rapid7