Suite Full //free\\: Cve20207796 Zimbra Collaboration

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

Her boss waves it off. "It's just an SSRF. Internal network only. Patch it next week."

This vulnerability is considered due to several key factors that make it exceptionally dangerous:

Once the user clicks the link, the XSS payload executes in their browser, with full access to: cve20207796 zimbra collaboration suite full

To secure your environment, the following actions are recommended by security researchers and official Zimbra documentation :

Yes. . The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has officially added this vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog, confirming its active use by threat actors.

She decides to test on a staging clone.

The server can read restricted internal resources, enabling access to local metadata services, developer portals, or cloud instance endpoints (e.g., AWS IMDS endpoints).

The vulnerability resides in improper sanitization of user-supplied input passed to the fmt parameter within certain Zimbra endpoints, such as:

: On your server (as root), refresh your package repositories: # For Ubuntu/Debian apt-get update Use code with caution. Copied to clipboard Install the Patch apt-get upgrade zimbra-patch Use code with caution. Copied to clipboard Restart Services : Switch to the zimbra user and restart the control system: su - zimbra zmcontrol restart Use code with caution. Copied to clipboard Immediate Mitigation (If Patching is Delayed) If you cannot upgrade immediately, consider the following: Disable the WebEx Zimlet Block URL patterns containing /service/home/~/*

However, if you meant (a real Zimbra vulnerability involving unauthenticated XXE leading to information disclosure), or another similar Zimbra CVE, I’d be glad to:

Restrict outbound connections from the Zimbra server to only necessary external destinations to prevent the server from being used as a proxy for malicious requests.

Attackers exploit this by sending a crafted HTTP POST request containing a malicious URL payload to the vulnerable endpoint (typically involving files like httpPost.jsp ). Because the application trusts input blindly, it processes the request and executes an outbound network connection to the targeted URL on behalf of the attacker. The Threat Mechanism (SSRF) Internal network only