CVE-2026-50055CWE-863broken-access-control

CVE-2026-50055

Medium · published October 8, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
18.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00274 · 18.8th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-10-08T21:17Z
References (1)
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories · [email protected]
EPSS history
Timeline
  • 10 OCT 03:29Z
    EPSS moved — → 0%
    epss
  • 08 OCT 16:25Z
    Zimbra Collaboration Suite Sieve Notify Filter Action Bypasses Mail Forwarding Restriction via Variable Expansion
    cvelistv5
  • 08 OCT 16:25Z
    Zimbra Collaboration Suite Sieve Notify Filter Action Bypasses Mail Forwarding Restriction via Variable Expansion
    cvelistv5