# CVE-2026-10632: Zimbra Collaboration Suite reflected XSS in Classic Web Client

Source: https://junglewise.ai/threats/cve-2026-10632-a-reflected-cross-site-scripting-vulnerability-in-the-classic-web  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-23. Updated: 2026-10-23  
License: CC BY 4.0 with a link back

CVE-2026-10632 · Severity: high · CVSS 8.7 · Published 2026-10-23

Zimbra Collaboration Suite is an enterprise email and collaboration platform used by organizations for messaging, calendars, and document sharing. A reflected cross-site scripting flaw in the Classic Web Client allows an attacker with a valid account to craft a malicious link that executes JavaScript in another user's browser session, enabling theft of emails, calendar data, and execution of actions as the victim. When combined with another vulnerability, attackers can trick users into clicking a link without needing direct account compromise.

Technologies: [Zimbra Collaboration Suite](https://junglewise.ai/threats/technologies/collaboration). Vendors: [Zimbra](https://junglewise.ai/threats/vendors/zimbra).

## Quick answers

**Is CVE-2026-10632 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-10632 being exploited in the wild.

**How severe is CVE-2026-10632?** High severity, with a CVSS score of 8.7, published 23 October 2026.

**Which products and versions are affected?** Zimbra Collaboration Suite 10.1.16.

**Is there a fix for CVE-2026-10632?** Yes: fixed in 10.1.17. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-10632 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-10632?** Check whether you run Zimbra Collaboration Suite at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 10.1.17

## Technical details

The vulnerability is a reflected XSS in the /h/rest document editor endpoint where the packages parameter is inserted into script attributes without HTML encoding. An attacker with an ordinary Zimbra account can supply a crafted URL containing malicious JavaScript; if a signed-in user opens this URL, the script executes in their session context. Combined with CVE-2026-50053, this permits reading mailbox data and performing authenticated actions as the victim.

## Affected products

- Zimbra Collaboration Suite 10.1.16

## Timeline

- 2026-10-23: disclosed

## References

- [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/)

## Related threats

- [Zimbra Collaboration Suite local privilege escalation in dnscache](https://junglewise.ai/threats/cve-2026-93640-a-local-privilege-escalation-vulnerability-in-the-optional)
- [Zimbra Collaboration Suite authorization bypass in Zimlet configuration](https://junglewise.ai/threats/cve-2026-93639-a-missing-authorization-vulnerability-in-zimbra-collaboration)
- [Zimbra Collaboration Suite reflected cross-site scripting in login](https://junglewise.ai/threats/cve-2026-93638-a-reflected-cross-site-scripting-vulnerability-in-the-login-page)
- [Zimbra Collaboration Suite LDAP filter injection](https://junglewise.ai/threats/cve-2026-93636-an-ldap-filter-injection-vulnerability-in-zimbra-collaboration)
- [Zimbra Collaboration Suite cross-account authorization bypass in FileSharedWithMeRequest](https://junglewise.ai/threats/cve-2026-93634-a-cross-account-authorization-vulnerability-in-zimbra)