Zimbra Collaboration Suite 9.0/10.0 CalendarInvite cross site scripting

Summaryinfo

A vulnerability was found in Zimbra Collaboration Suite 9.0/10.0. It has been rated as problematic. Impacted is an unknown function of the component CalendarInvite. The manipulation leads to cross site scripting. This vulnerability is traded as CVE-2024-27443. It is possible to initiate the attack remotely. Furthermore, there is an exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Zimbra Collaboration Suite 9.0/10.0. This issue affects an unknown function of the component CalendarInvite. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

An issue was discovered in Zimbra Collaboration (ZCS) 9.0 and 10.0. A Cross-Site Scripting (XSS) vulnerability exists in the CalendarInvite feature of the Zimbra webmail classic user interface, because of improper input validation in the handling of the calendar header. An attacker can exploit this via an email message containing a crafted calendar header with an embedded XSS payload. When a victim views this message in the Zimbra webmail classic interface, the payload is executed in the context of the victim's session, potentially leading to execution of arbitrary JavaScript code.

The advisory is shared at wiki.zimbra.com. The identification of this vulnerability is CVE-2024-27443 since 02/26/2024. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are unknown but an exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

It is declared as attacked. The vulnerability scanner Nessus provides a plugin with the ID 237012 (Zimbra Collaboration Server 9.x < 9.0.0 Patch 39, 10.0.x < 10.0.7 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 05/19/2025 with a due date of 06/09/2025:

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (237012) and EUVD (EUVD-2024-24646). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Groupware Software

Name

• Zimbra Collaboration Suite

Version

• 9.0
• 10.0

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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