CVE-2026-50057: Zimbra Collaboration Suite Local Privilege Escalation via Unrestricted Postfix Sudo Permissions
Zimbra · Zimbra Collaboration Suite
Vendor fix available · Affected: Zimbra Collaboration Suite · Exploitation: not established
ExploitationNot established
Not in CISA KEV as of catalogue 2026.11.13 (13 Nov)
- In CISA KEV: not seen
- Exploited (reported): not seen
- Scanning observed: not seen
- Proof of concept public: not seen
- Not establishedNothing in the sources we check
Higher than 19% of scored CVEs
Not scored yet. NVD has not published a CVSS score.
DescriptionNVD
A local privilege escalation vulnerability in the Zimbra Collaboration Suite (ZCS) MTA package allows the Unix zimbra account to execute arbitrary commands as root. The installed sudo policy permits passwordless root execution of Postfix administration commands without restricting their arguments. An attacker can select a zimbra-controlled daemon_directory in the Postfix configuration and invoke postfix set-permissions, causing Postfix to execute the attacker's post-install program as root. The Postfix configuration directory is also writable by zimbra, so restricting postconf alone does not remove the execution path. Exploitation requires local command execution as zimbra on an MTA node. ZCS 10.1.16 and 10.1.21 are affected.
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Zimbra
- Published
- October 2026
Coverage1 article · 1 outlet
First in our coverage: SecurityOnline, 27 Oct.
- Rapid7 Discloses 17 Flaws in Zimbra Collaboration SuiteSecurityOnline · first in our coverage · mentions it in passing
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