Cve20207796 Zimbra Collaboration Suite Full !!better!! -

The fix involved:

Upgrade to Zimbra Collaboration Suite 8.8.15 Patch 7 or higher .

If patching cannot be executed immediately, administrators can remove the specific exposed file manually to stop the exploit vector: cve20207796 zimbra collaboration suite full

Disclaimer: Information provided is for educational purposes based on vulnerability data available as of 2026. Always consult official Zimbra advisory notices for the latest security patches.

CVE-2020-7796 - Zimbra Collaboration Suite (ZCS) Remote Code Execution Vulnerability The fix involved: Upgrade to Zimbra Collaboration Suite 8

is a critical Server-Side Request Forgery (SSRF) vulnerability affecting the Zimbra Collaboration Suite (ZCS) . Assigned a maximum CVSS v3 base score of 9.8 out of 10 , this unauthenticated security flaw poses an extreme risk to enterprise communication infrastructure. Attackers can exploit this bug remotely to bypass firewalls, probe internal networks, or steal sensitive cloud credentials.

CVE-2020-7796 is a critical Server-Side Request Forgery (SSRF) vulnerability in the Zimbra Collaboration Suite (ZCS) . It has been added to CISA's Known Exploited Vulnerabilities (KEV) Catalog CVE-2020-7796 - Zimbra Collaboration Suite (ZCS) Remote Code

: If Zimbra is hosted in public cloud environments (such as AWS, Google Cloud, or Azure), attackers can target the local Instance Metadata Service (IMDS) at http://169.254.169.254 . This allows them to extract temporary IAM credentials, cloud configuration keys, and environment variables.

Interestingly, the official fix for this vulnerability in Zimbra 8.8.15 Patch 7 was remarkably simple: the httpPost.jsp file was removed. According to a Zimbra forum post, "patch7 simply removes this file via RPM postinstall scriptlet: rm -f /opt/zimbra/zimlets-deployed/com_zimbra_webex/httpPost.jsp ". This underscores the fact that the vulnerable endpoint was a leftover, unnecessary file, making its complete removal the most effective remediation.

The flaw is classified under . It stems from insufficient validation of user-supplied URLs within a core application endpoint. Specifically, the vulnerability triggers when: The WebEx Zimlet is installed on the ZCS system. The Zimlet JSP (JavaServer Pages) functionality is enabled.

Exploiting this vulnerability is straightforward for an attacker. A malicious, unauthenticated HTTP request like the one below can be crafted to target the vulnerable JSP file: