Detections
Analytics

Zimbra Collaboration Server 10.1.x < 10.1.20 Multiple Vulnerabilities

medium Nessus Plugin ID 329328

Synopsis

The remote web server contains a web application that is affected by multiple vulnerabilities.

Description

According to its self-reported version number, Zimbra Collaboration Server is affected by multiple vulnerabilities including:

 - A security issue in the EWS extension related to access controls. (CVE-2026-10631)

 - An authorization issue in mailbox delegation. (CVE-2026-50054)

 - A mail forwarding restriction bypass that could allow authenticated users to exfiltrate email despite mail forwarding restrictions being enabled. (CVE-2026-50055)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to version 10.1.20 or later.

See Also

https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.20

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

Plugin Details

Severity: Medium

ID: 329328

File Name: zimbra_10_1_20.nasl

Version: 1.1

Type: Combined

Agent: unix

Family: CGI abuses

Published: 7/24/2026

Updated: 7/24/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Vulnerability Information

CPE: cpe:/a:zimbra:collaboration_suite

Required KB Items: installed_sw/zimbra_zcs

Patch Publication Date: 7/20/2026

Vulnerability Publication Date: 7/20/2026

Reference Information

CVE: CVE-2026-10631, CVE-2026-50054, CVE-2026-50055

IAVA: 2026-A-0761