---
id: CVE-2026-73572
title: >-
  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
summary: >-
  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 ca…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
published: '2026-08-13'
updated: '2026-08-21'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73572'
references:
  - url: 'https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy'
    label: cve@mitre.org
  - url: 'https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories'
    label: cve@mitre.org
tags:
  - nvd
epss: 0.00155
epssPercentile: 0.04996
ingestedAt: '2026-08-22T13:32:36.159Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.