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MEDIUM · CVSS 6.1 CISA Known Exploited Vulnerability

CVE-2022-27926

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

Synacor Zimbra Collaboration Suite (ZCS)

A reflected cross-site scripting (XSS) vulnerability in the /public/launchNewWindow.jsp component of Zimbra Collaboration (aka ZCS) 9.0 allows unauthenticated attackers to execute arbitrary web script or HTML via request parameters.

CVSS
6.1
MEDIUM
EPSS
17.6%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
21 Apr 2022
CWE-79

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 3 April 2023. US federal agencies were required to remediate it by 24 April 2023.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 17.6%, which is higher than 97.2% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

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

Frequently asked questions

Is CVE-2022-27926 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2022-27926.

What does CVE-2022-27926 affect?

CVE-2022-27926 affects Synacor Zimbra Collaboration Suite (ZCS). A reflected cross-site scripting (XSS) vulnerability in the /public/launchNewWindow.jsp component of Zimbra Collaboration (aka ZCS) 9.0 allows unauthenticated attackers to execute arbitrary web script or HTML via request parameters.

How severe is CVE-2022-27926?

CVE-2022-27926 is rated MEDIUM with a CVSS base score of 6.1. EPSS puts the probability of exploitation in the next 30 days at 17.6%, higher than 97.2% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 24 April 2023.

How should organisations respond to CVE-2022-27926?

Apply the vendor patch for Synacor Zimbra Collaboration Suite (ZCS) as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.