Summaryinfo

A vulnerability has been found in Zimbra Collaboration Suite 8.8.15 and classified as critical. Affected by this vulnerability is an unknown functionality of the component PostJournal Service. Performing a manipulation of the argument RCPT TO results in os command injection. This vulnerability was named CVE-2025-71275. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as very critical, was found in Zimbra Collaboration Suite 8.8.15. This affects an unknown part of the component PostJournal Service. The manipulation of the argument RCPT TO with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was presented by indoushka. It is possible to read the advisory at packetstorm.news. This vulnerability is uniquely identified as CVE-2025-71275 since 03/18/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/24/2026). The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-208960). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Groupware Software

Vendor

• Zimbra

Name

• Collaboration Suite

Version

• 8.8.15

CPE 2.3info

• 🔒

CPE 2.2info

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