Cve20207796 Zimbra Collaboration Suite Full [upd] Instant

This vulnerability has been widely exploited in the wild. Shortly after the publication of the Proof of Concept (PoC) code, automated bots began scanning the internet for vulnerable Zimbra servers. Security researchers observed that threat actors were utilizing this flaw to deploy web shells (such as kthxm.jsp or variations of the "China Chopper" shell) to establish persistent access. In many cases, the attacks were not immediately destructive; instead, actors silently exfiltrated data or used the compromised mail servers to send spam and phishing emails to other organizations.

: Closely watch application logs for anomalous outbound HTTP requests or suspicious DNS queries. Detection Guidance cve20207796 zimbra collaboration suite full

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added this flaw to its Known Exploited Vulnerabilities (KEV) catalog in February 2026 due to active exploitation in the wild. 🛡️ Vulnerability Overview : Server-Side Request Forgery (SSRF) CVSS v3.1 Score : 9.8 (Critical) This vulnerability has been widely exploited in the wild

The Zimbra Collaboration Suite, a popular open-source email and collaboration platform, has been vulnerable to a critical security flaw, known as CVE-2020-7796. This vulnerability affects the full suite, exposing millions of users worldwide to potential cyber threats. In this article, we will explore the details of the vulnerability, its impact, and the necessary steps to mitigate the risks. In many cases, the attacks were not immediately

Potential for further exploitation or pivoting within the network. National Institute of Standards and Technology (.gov) Technical Analysis The flaw exists within a specific component of the suite: Trigger Component: WebEx zimlet Root Cause: Insufficient validation of user-supplied input when the zimlet JSP (Jakarta Server Pages) functionality is enabled. Exploitation:

An attacker can exploit this vulnerability by sending a crafted HTTP request to the vulnerable endpoint, which can lead to the execution of arbitrary code on the system. This can allow the attacker to gain unauthorized access to sensitive data, disrupt email services, or even take control of the entire system.