CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild and listed in the CISA Known Exploited Vulnerabilities catalog.

Remediation Deadline: Apr 23, 2026

CVE-2025-48700

High

CISA KEV

Synacor/Zimbra Collaboration Suite (ZCS)

Description

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that could allow attackers to execute arbitrary JavaScript within the user's session, potentially leading to unauthorized access to sensitive information.

Required Action

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://nvd.nist.gov/vuln/detail/CVE-2025-48700

Risk Assessment

ELEVATED

In CISA KEV

Details

Severity: High
CISA KEV: Yes
Ransomware: Unknown
Articles: 0

Timeline

Published

Apr 20, 2026

Added to KEV

Apr 20, 2026

Remediation Due

Apr 23, 2026

Affected Product

Synacor

Zimbra Collaboration Suite (ZCS)

View all Synacor CVEs

External Links

NVD (NIST)CVE Details MITRE CVE