known ransomware use

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

Added to KEV
2022-02-25
Federal due date
2022-03-11
Vendor
Synacor
Product
Zimbra Collaborate Suite (ZCS)
EPSS
99.5th percentile (score 0.886, as of 2026-06-08)
NVD CVSS v3.1
Ransomware use
Known
Upstream
https://nvd.nist.gov/vuln/detail/CVE-2022-24682

CISA short description

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting (XSS) vulnerability in the Calendar feature that allows an attacker to execute arbitrary code.

Required action

Apply updates per vendor instructions.

EPSS percentile is the FIRST.org exploit-probability ranking as of the date noted above; it moves daily. CVSS reflects NVD's analysis at time of publication.