CVE-2026-50055

MEDIUM

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 v3.1 Score

6.5
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Published: 10/8/2026Modified: 10/8/2026

Related Intelligence (1)

LOWApt

From One Account to Every Mailbox: Breaking Zimbra's Identity Boundaries (Part 1)

An enterprise mail server authenticates users, stores private communications, delivers recovery links, runs calendars, and sends mail that employees and other systems trust. Compromising it can therefore expose both email and the identities and workflows built around it. During a broader assessment of Zimbra Collaboration Suite (ZCS), Rapid7 reported more than 80 vulnerabilities spanning authentic

CVE-2026-93637CVE-2026-93635
Rapid7

References (1)

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories