SB2025110653 - Multiple vulnerabilities in Zimbra Collaboration (ZCS)
Published: November 6, 2025 Updated: January 23, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 8 secuirty vulnerabilities.
1) Stored cross-site scripting (CVE-ID: CVE-2025-66376)
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data. A remote attacker can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
2) Path traversal (CVE-ID: N/A)
The vulnerability allows a remote user to perform directory traversal attacks.
The vulnerability exists due to input validation error when processing directory traversal sequences within the ExportAndDeleteItemsRequest API. A remote user can send a specially crafted HTTP request and read arbitrary files on the system.
3) Cross-site request forgery (CVE-ID: N/A)
The vulnerability allows a remote attacker to perform cross-site request forgery attacks.
The vulnerability exists due to insufficient validation of the HTTP request origin in specific authentication flows. A remote attacker can trick the victim to visit a specially crafted web page and perform arbitrary actions on behalf of the victim on the vulnerable website.
4) PHP file inclusion (CVE-ID: CVE-2025-68645)
The vulnerability allows a remote attacker to include and execute arbitrary PHP files on the server.
The vulnerability exists due to incorrect input validation when including PHP files in the RestFilter. A remote non-authenticated attacker can send a specially crafted HTTP request to the affected application, include and execute arbitrary PHP code on the system with privileges of the web server.
5) Use of hard-coded credentials (CVE-ID: CVE-2025-67809)
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to presence of hard-coded credentials within the Flickr API from the Flickr Zimlet. A remote attacker could use the credentials to access uploaded images.
6) Stored cross-site scripting (CVE-ID: N/A)
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data in Zimbra Mail Client for emails with PDF attachments. A remote attacker can send a specially crafted email to the victim and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
7) Information exposure through externally-generated error message (CVE-ID: N/A)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output in the PreAuthServlet while handling error conditions. A remote attacker can obtain sensitive information on the system.
8) Information disclosure (CVE-ID: N/A)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application. A remote attacker can enumerate admin user accounts.
Remediation
Install update from vendor's website.