# CVE-2022-27926: Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability

Source: https://junglewise.ai/threats/cve-2022-27926-synacor-zimbra-collaboration-suite-zcs-cross-site-scripting-xss  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2023-04-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2022-27926 · Severity: critical · CVSS 6.1 · Exploited in the wild · Published 2023-04-03

A reflected cross-site scripting (XSS) vulnerability in the /public/launchNewWindow.jsp component of Zimbra Collaboration Suite (ZCS) allows unauthenticated attackers to execute arbitrary web script or HTML via unsanitized request parameters. This vulnerability has been observed being exploited in the wild.

Technologies: [Synacor Zimbra Collaboration Suite (ZCS)](https://junglewise.ai/threats/technologies/zimbra-collaboration-suite-zcs). Vendors: [Synacor](https://junglewise.ai/threats/vendors/synacor).

## Quick answers

**Is CVE-2022-27926 exploited in the wild?** Yes. CVE-2022-27926 is known to be exploited in the wild, first recorded on 3 April 2023. Treat it as urgent.

**How severe is CVE-2022-27926?** Critical severity, with a CVSS score of 6.1, published 3 April 2023.

**Which products and versions are affected?** Synacor Zimbra Collaboration Suite (ZCS) 9.0.0 up to Patch 23.

**Is there a fix for CVE-2022-27926?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2022-27926 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2022-27926?** Check whether you run Synacor Zimbra Collaboration Suite (ZCS). 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.

## Affected products

- Synacor Zimbra Collaboration Suite (ZCS) 9.0.0 up to Patch 23

## Timeline

- 2022-04-28: disclosed: Initial NIST analysis date
- 2023-04-03: kev added: Added to CISA Known Exploited Vulnerabilities (KEV) catalog

## Related threats

- [Zimbra Collaboration Suite OS command injection in SMTP](https://junglewise.ai/threats/cve-2026-73570-zimbra-collaboration-suite-os-command-injection-in-smtp)
- [Synacor Zimbra Collaboration Suite XSS in Classic UI](https://junglewise.ai/threats/cve-2025-48700-synacor-zimbra-collaboration-suite-xss-in-classic-ui)
- [Synacor Zimbra Collaboration Suite stored XSS in Classic UI](https://junglewise.ai/threats/cve-2025-66376-synacor-zimbra-collaboration-suite-stored-xss-in-classic-ui)
- [Synacor Zimbra Collaboration Suite file inclusion in RestFilter servlet](https://junglewise.ai/threats/cve-2025-68645-synacor-zimbra-collaboration-suite-file-inclusion-in-restfilter)
- [Synacor Zimbra Collaboration Suite XSS in Classic Web Client](https://junglewise.ai/threats/cve-2025-27915-synacor-zimbra-collaboration-suite-xss-in-classic-web-client)