CVE-2025-71275 PUBLISHED

Zimbra Collaboration Suite PostJournal 8.8.15 Unauthenticated Remote Code Execution via SMTP Injection

Assigner: VulnCheck
Reserved: 18.03.2026 Published: 24.03.2026 Updated: 24.03.2026

Zimbra Collaboration Suite (ZCS) PostJournal service version 8.8.15 contains a command injection vulnerability that allows unauthenticated attackers to execute arbitrary system commands by exploiting improper sanitization of the RCPT TO parameter via SMTP injection. Attackers can inject shell expansion syntax through the RCPT TO parameter to achieve remote code execution under the Zimbra service context.

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 9.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	Zimbra
Product	Zimbra Collaboration Suite
Versions	Default: unaffected Version 8.8.15 is affected

Credits

indoushka finder

References

Problem Types

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') (CWE-78) CWE