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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation poc

Automatable yes

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Zimbra Zimbra Collaboration Suite unaffected
Version Status Constraints
8.8.15 affected —

No data.

No data.

No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://packetstorm.news/files/id/212108/ cve-icon cve-icon
https://www.vulncheck.com/advisories/zimbra-collaboration-suite-postjournal-unauthenticated-remote-code-execution-via-smtp-injection cve-icon cve-icon
https://www.zimbra.com/ cve-icon cve-icon
History

Tue, 24 Mar 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Tue, 24 Mar 2026 16:00:00 +0000

Type Values Removed Values Added
Description A critical security vulnerability exists in Zimbra Collaboration Suite (ZCS) PostJournal service version 8.8.15 that allows unauthenticated attackers to execute arbitrary system commands via SMTP injection. The vulnerability is triggered through improper sanitization of the RCPT TO parameter, enabling command injection using shell expansion syntax (e.g., $(COMMAND)). Successful exploitation results in remote code execution under the Zimbra service context without requiring authentication. 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.
Weaknesses CWE-77 CWE-78

Tue, 24 Mar 2026 15:45:00 +0000

Type Values Removed Values Added
Description A critical security vulnerability exists in Zimbra Collaboration Suite (ZCS) PostJournal service version 8.8.15 that allows unauthenticated attackers to execute arbitrary system commands via SMTP injection. The vulnerability is triggered through improper sanitization of the RCPT TO parameter, enabling command injection using shell expansion syntax (e.g., $(COMMAND)). Successful exploitation results in remote code execution under the Zimbra service context without requiring authentication.
Title Zimbra Collaboration Suite PostJournal 8.8.15 Unauthenticated Remote Code Execution via SMTP Injection
Weaknesses CWE-77
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, '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'}

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-03-24T15:51:30.294Z

Reserved: 2026-03-18T19:38:57.984Z

Link: CVE-2025-71275

cve-icon Vulnrichment

Updated: 2026-03-24T15:51:23.780Z

cve-icon NVD

Status : Received

Published: 2026-03-24T16:16:27.593

Modified: 2026-03-24T16:16:27.593

Link: CVE-2025-71275

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses