The vulnerability impacts . Remediation and Mitigation

CVE-2020-7796 is a Server-Side Request Forgery (SSRF) vulnerability in the Zimbra Collaboration Suite (ZCS) . Vulnerability Details Severity : Critical (CVSS Score: 9.8 ).

: U.S. Federal agencies have been mandated to apply fixes by March 10, 2026 . Zimbra Collaboration Suite SSRF (CVE-2020-7796) - Acunetix

Information from internal systems could be sent to an attacker-controlled external server. Remediation and Mitigation

Successful SSRF can be a gateway to stealing login credentials, injecting malware, or gaining a foothold for lateral movement within a network. Mitigation and Remediation CVE-2020-7796 Detail - NVD

: Limit outbound connections from the Zimbra server to only essential destinations.

is a critical Server-Side Request Forgery (SSRF) vulnerability affecting the Zimbra Collaboration Suite (ZCS) . This flaw allows an unauthenticated, remote attacker to bypass external network perimeters and manipulate the enterprise email server into executing unauthorized HTTP requests. Because Zimbra is a cornerstone of infrastructure for governments, financial institutions, and global enterprises, the Cybersecurity and Infrastructure Security Agency (CISA) added CVE-2020-7796 to its Known Exploited Vulnerabilities (KEV) catalog due to active exploitation in the wild. Technical Breakdown: Understanding the Flaw

The vulnerability exists in how the WebEx Zimlet handles specific requests. By manipulating the parameters within a crafted request, an attacker can trick the Zimbra server into fetching content from an attacker-specified URL.

In an SSRF attack, an unauthenticated remote attacker can force the vulnerable Zimbra server to make HTTP requests to arbitrary internal or external hosts. Internal Proxying

Zimbra Collaboration Suite (ZCS) versions before 8.8.15 Patch 7 How to Fix It The primary remediation is to

In some scenarios, SSRF can be a stepping stone to remote code execution (RCE) or further network pivot attacks. Remediation and Patching

Critical Security Alert: Zimbra Collaboration Suite SSRF (CVE-2020-7796) If your organization relies on Zimbra Collaboration Suite (ZCS)

: Look for unusual outbound connections or suspicious requests in your Zimbra and proxy logs. Zimbra Collaboration Suite SSRF (CVE-2020-7796) - Acunetix

. Given Zimbra’s widespread use as an enterprise-grade email and collaboration platform, this vulnerability represents a severe vector for network infiltration. The Cybersecurity and Infrastructure Security Agency (CISA) added this flaw to its Known Exploited Vulnerabilities (KEV) catalog , mandating strict mitigation due to active exploitation observed in the wild. Technical Overview of CVE-2020-7796