CVE-2026-73572
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
In Zimbra Collaboration (ZCS) before 10.1.17, there is a stored cross-site scripting (XSS) vulnerability in the Zimbra Classic Web Client due to insufficient sanitization of specific attachment content during inline preview. An attacker can send a crafted email containing a malicious attachment that, when previewed by a user, executes arbitrary JavaScript within the victim's browser session. Successful exploitation may allow an attacker to perform unauthorized actions on behalf of the victim user, potentially leading to data exfiltration or unauthorized access to sensitive information.
Risk Assessment
The risk includes the possibility of session hijacking, data theft, or unauthorized actions in the victim's context, which could compromise data confidentiality and integrity.
Recommendation
It is recommended to upgrade Zimbra Collaboration to version 10.1.17 or later, which includes a fix for the XSS vulnerability.
Original NVD description (English source)
In Zimbra Collaboration (ZCS) before 10.1.17, a stored cross-site scripting (XSS) vulnerability exists in the Zimbra Classic Web Client due to insufficient sanitization of specific attachment content during inline preview. An attacker can send a crafted email containing a malicious attachment that, when previewed by a user, executes arbitrary JavaScript within the victim's browser session. Successful exploitation may allow an attacker to perform unauthorized actions on behalf of the victim user, potentially leading to data exfiltration or unauthorized access to sensitive information.