CVE-2022-24682 Synacor Zimbra Collaborate Suite (ZCS) Cross-Site Scripting

Exploited in the wild Medium 6.1 Published 9 Feb 2022 Updated 7 Aug 2026

Attackers can inject arbitrary JavaScript into Zimbra Calendar attributes, enabling code execution and potential account takeover.

Exploited in the wild: Since 25 Feb 2022
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-2022-24682?

CVE-2022-24682 is a medium-severity cross-site scripting vulnerability in Synacor Zimbra Collaboration Suite, published on 9 Feb 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

An issue was discovered in the Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 (update 1), as exploited in the wild starting in December 2021. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.

Weakness: CWE-116

Which versions are affected by CVE-2022-24682?

It affects 1 product.

Products include Synacor Zimbra Collaboration Suite.

How do I fix CVE-2022-24682?

No fix has been published for CVE-2022-24682 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 11 Mar 2022.

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-2022-24682 being exploited?

Yes. Attackers have exploited CVE-2022-24682 in the wild since at least 25 Feb 2022, including in ransomware campaigns.

Public exploit code: 1 Nuclei template.

All Synacor Zimbra Collaboration Suite vulnerabilities

Sources

Also known as GHSA-fh88-2p7h-7g9h.