---
id: "CVE-2022-24682"
kind: "vulnerability"
aliases: ["CVE-2022-24682"]
title: "Synacor Zimbra Collaborate Suite (ZCS): Synacor Zimbra Collaborate Suite (ZCS) Cross-Site Scripting Vulnerability"
severity: "medium"
cvss: 6.1
epss: 0.30931
exploited: true
status: "open"
category: "package"
products: [{"name": "Synacor Zimbra Collaborate Suite (ZCS)", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["email", "exploited", "package", "ransomware", "self-hosted", "zimbra"]
not_affected_if: ["managed-hosting"]
published_at: "2022-02-09T04:15:07+00:00"
first_seen_at: "2026-10-23T19:11:52+00:00"
updated_at: "2026-10-23T21:57:35+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2022-24682", "first_seen_at": "2026-10-23T19:11:52+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2022-24682", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-24682", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# Synacor Zimbra Collaborate Suite (ZCS): Synacor Zimbra Collaborate Suite (ZCS) Cross-Site Scripting Vulnerability

Zimbra Collaboration Suite has a cross-site scripting flaw in its Calendar feature. An attacker can run script in a victim's browser session, which the description says can lead to arbitrary code execution.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Synacor Zimbra Collaborate Suite (ZCS) affected ? fixed ?

## Fix

Apply the Synacor/Zimbra update per vendor instructions (CISA KEV required action); the fixed version is unknown from the sources.

## Timeline

- 2026-10-23T19:11:52+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2022-24682
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2022-24682
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2022-24682

## From the sources

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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_