CVE-2026-50055: medium-severity vulnerability in Zimbra Collaboration Suite
Zimbra Collaboration Suite Sieve Notify Filter Action Bypasses Mail Forwarding Restriction via Variable Expansion
Published
33Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 6.5epss 0.3%
from disclosure to weapon0 days
Published on NVDOct 8
1st PoCJul 22
exploitation probability
0.3%top 82% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Affected products
Zimbra · Zimbra Collaboration Suitepublic PoCs found — 1
githubgithub.com/HORKimhab/CVE-2026-50055★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — Zimbra Collaboration Suite
In the same product, most dangerous first.