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

79.58 %

Predictive Probability

Percentile Rank

99.1 th

Documented as more likely to be exploited than 99.1% 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.

External Intelligence

NVD

National Vulnerability Database

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