Cve20207796 Zimbra Collaboration Suite Full |best| Jun 2026

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CVE-2020-7796 is a critical vulnerability in the Zimbra Collaboration Suite, a popular open-source email and collaboration platform. The vulnerability allows an unauthenticated attacker to exploit a weakness in the Zimbra suite, potentially leading to unauthorized access to sensitive information. cve20207796 zimbra collaboration suite full

The vulnerability exists due to insufficient validation of user-supplied URLs within a specific component of the Zimbra application—specifically when the is installed and its JSP (JavaServer Pages) file is enabled. By chaining: CVE-2020-7796 is a critical vulnerability in

If immediate patching is not possible, organizations should consider disabling the WebEx zimlet if it is not business-critical, as this removes the attack vector. Vendor Guidance: Refer to the official Zimbra 8.8.15 P7 Release Notes for specific patching instructions. Proof of Concept (PoC) If immediate patching is not possible, organizations should

Block URL patterns containing /service/home/~/*?*fmt=* and any parameter with <script , javascript: , onerror= , etc.

By sending a specially crafted HTTP request to the vulnerable JSP file, an attacker forces the server to act as a proxy, making requests to other URLs on their behalf. Affected Versions Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7 Remediation & Mitigation Administrators should prioritize the following actions: ZCS 8.8.15 Patch 7