CVE-2024-27443

MEDIUM CISA KEV

Published Aug 12, 2024 Modified Oct 31, 2025 CWE-79

Description

An issue was discovered in Zimbra Collaboration (ZCS) 9.0 and 10.0. A Cross-Site Scripting (XSS) vulnerability exists in the CalendarInvite feature of the Zimbra webmail classic user interface, because of improper input validation in the handling of the calendar header. An attacker can exploit this via an email message containing a crafted calendar header with an embedded XSS payload. When a victim views this message in the Zimbra webmail classic interface, the payload is executed in the context of the victim's session, potentially leading to execution of arbitrary JavaScript code.

CVSS v3.1 Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild.

Added: May 19, 2025 Remediation due: Jun 9, 2025

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
zimbra	collaboration	10.0.0 — 10.0.7
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All
zimbra	collaboration	All

References

Other References

https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.7#Security_Fixes https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P39#Security_Fixes https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-27443 https://www.welivesecurity.com/en/eset-research/operation-roundpress/

Frequently Asked Questions

What is CVE-2024-27443? +

How severe is CVE-2024-27443? +

CVE-2024-27443 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-27443? +

CVE-2024-27443 affects products from zimbra, specifically: collaboration. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-27443? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-40282

WeGIA is a web manager for charitable institutions. In versions prior to 3.6.10, a Stored Cross-Site Scripting (XSS) vulnerability allows …

CVE-2026-3317

Reflected Cross-Site Scripting (XSS) vulnerability in Navigate Content Management System. The vulnerability is present in the '/blog' endpoint because user …

CVE-2025-10354

Cross-Site Scripting (XSS) vulnerability reflected in Semantic MediaWiki. This vulnerability allows an attacker to execute JavaScript code in the victim's …

CVE-2026-41456

Bludit CMS prior to commit 6732dde contains a reflected cross-site scripting vulnerability in the search plugin that allows unauthenticated attackers …

CVE-2026-40872

mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, the admin dashboard's Autodiscover …

CVE-2026-40878

mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, the mailcow web interface …