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

Critical Threat Advisory: This vulnerability is documented in active Ransomware campaigns. Immediate remediation required.

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

63.35 %

Predictive Probability

Percentile Rank

98.4 th

Documented as more likely to be exploited than 98.4% of known CVEs.

Detection Date

Apr 19, 2022

Remediation Due

May 10, 2022

CISA Catalog Active

Threat Analysis

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that might allow remote attackers to inject arbitrary web script or HTML.

Remediation Directive

Apply updates per vendor instructions.

Asset Context

Vendor Identity

Synacor

Affected Product

Zimbra Collaboration Suite (ZCS)

Ransomware Status

Campaign Use Known

Weakness Classification

CWE-79

External Intelligence

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2018-6882