Home / Vulnerabilities / CVE-2024-27443
MEDIUM SEVERITY
CVE-2024-27443 Synacor · Zimbra Collaboration Suite (ZCS)

Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability

Technical Severity

CVSS v3.1 Metrics

MEDIUM
6.1 / 10
Minimal Risk Critical
Vector Specification
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Exploitation Likelihood

EPSS Prediction

32.43 %
Predictive Probability
Percentile Rank
96.7 th

Documented as more likely to be exploited than 96.7% of known CVEs.

Detection Date

May 19, 2025

Remediation Due

Jun 09, 2025

CISA Catalog Active

Threat Analysis

Zimbra Collaboration contains a cross-site scripting (XSS) vulnerability in the CalendarInvite feature of the Zimbra webmail classic user interface. An attacker can exploit this vulnerability via an email message containing a crafted calendar header, leading to the execution of arbitrary JavaScript code.

Remediation Directive

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

External Intelligence

https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P46#Security_Fixes

https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P46#Security_Fixes

https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P39#Security_Fixes

https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P39#Security_Fixes

https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.7#Security_Fixes

https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.7#Security_Fixes
NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2024-27443