CVE-2026-73572

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.

Score

CVSS 3.1 6.1 Medium

Status

Analyzed - cve@mitre.org

Published

2026-08-13

Last modified

2026-08-13

Weaknesses

CWE-79

Affected products

• Zimbra Collaboration Suite (Synacor)
• Collaboration (Zimbra)

References

• https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
• https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories