---
title: "CVE-2026-10632: Zimbra Collaboration Suite - Reflected XSS"
description: "Zimbra Collaboration Suite 10.1.16 contains a reflected XSS caused by improper HTML encoding of the packages parameter in /h/rest document editor, letting attackers inject JavaScript to execute in another user's session, exploit requires victim to open crafted URL."
url: https://panop.io/threat-heartbeat/CVE-2026-10632/
---

# CVE-2026-10632 Zimbra Collaboration Suite - Reflected XSS

Zimbra Collaboration Suite 10.1.16 contains a reflected XSS caused by improper HTML encoding of the packages parameter in /h/rest document editor, letting attackers inject JavaScript to execute in another user's session, exploit requires victim to open crafted URL.

CVSS base score 8.7 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.42% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-10632)

## Details

Type

Reflected XSS

Impact

Client Script Exec, Information Disclosure

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Published

23 October 2026

Updated

25 October 2026

Weakness

[CWE-79](https://cwe.mitre.org/data/definitions/79.html)

## Vendor fix

Upgrade to version 10.1.17 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-10632](https://nvd.nist.gov/vuln/detail/CVE-2026-10632)
- [https://wiki.zimbra.com/wiki/Zimbra\_Security\_Advisories](https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories)
- [https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/](https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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