SB2025100641 - Multiple vulnerabilities in Zimbra Collaboration

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Input validation error (CVE-ID: CVE-2025-53645)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper handling of excessive, comma-separated path segments in the Admin Console. A remote attacker can send specially crafted HTTP GET requests to the admin console and perform a denial of service (DoS) attack.

2) Stored cross-site scripting (CVE-ID: CVE-2025-27915)

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 when handling ICS files. A remote attacker can send an email message with a specially crafted calendar attachment and execute arbitrary JavaScript 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.

Note, the vulnerability is being actively exploited in the wild.

Remediation

Install update from vendor's website.

References

• https://wiki.zimbra.com/wiki/Security_Center#ZCS_9.0.0_Patch_46_Released
• https://wiki.zimbra.com/wiki/Security_Center#ZCS_10.0.15_Released
• https://wiki.zimbra.com/wiki/Security_Center#ZCS_10.1.9_Released
• https://strikeready.com/blog/0day-ics-attack-in-the-wild/