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

Exploited in the wild Medium 6.1 Published 20 Apr 2022 Updated 21 Oct 2025

Unauthenticated attackers can execute arbitrary scripts via reflected XSS in Zimbra Collaboration, potentially leading to account takeover.

Exploited in the wild: Since 3 Apr 2023
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2022-27926?

CVE-2022-27926 is a medium-severity cross-site scripting vulnerability in Synacor Zimbra Collaboration Suite, published on 20 Apr 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

A reflected cross-site scripting (XSS) vulnerability in the /public/launchNewWindow.jsp component of Zimbra Collaboration (aka ZCS) 9.0 allows unauthenticated attackers to execute arbitrary web script or HTML via request parameters.

Weakness: CWE-79

Which versions are affected by CVE-2022-27926?

It affects 1 product.

Products include Synacor Zimbra Collaboration Suite.

How do I fix CVE-2022-27926?

No fix has been published for CVE-2022-27926 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 24 Apr 2023.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2022-27926 being exploited?

Yes. Attackers have exploited CVE-2022-27926 in the wild since at least 3 Apr 2023.

Public exploit code: 1 Nuclei template.

All Synacor Zimbra Collaboration Suite vulnerabilities

Sources

Also known as GHSA-chc6-9436-6wfq.