CVE-2020-7796: Synacor Zimbra Collaboration Suite SSRF in WebEx zimlet

CVE-2020-7796 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2026-02-17

Zimbra Collaboration Suite, a widely used enterprise email and collaboration platform, contains a critical security flaw in its WebEx integration component. An attacker can exploit this vulnerability to force the server to perform unauthorized requests, potentially leading to the theft of sensitive internal data or full system takeover. This vulnerability has been observed being used in active attacks.

Technologies: Synacor Zimbra Collaboration Suite. Vendors: Synacor.

Quick answers

Is CVE-2020-7796 exploited in the wild?
Yes. CVE-2020-7796 is known to be exploited in the wild, first recorded on 17 February 2026. Treat it as urgent.
How severe is CVE-2020-7796?
Critical severity, with a CVSS score of 9.8, published 17 February 2026.
Which products and versions are affected?
Synacor Zimbra Collaboration Suite (ZCS) Before 8.8.15 Patch 7.
Is there a fix for CVE-2020-7796?
A patch was published on 2020-02-18: Fixed in 8.8.15 Patch 7 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2020-7796 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2020-7796?
Check whether you run Synacor Zimbra Collaboration Suite. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A Server-Side Request Forgery (SSRF) vulnerability (CWE-918) exists in Synacor Zimbra Collaboration Suite (ZCS) versions prior to 8.8.15 Patch 7. The flaw is located within the WebEx zimlet and is exploitable when zimlet JSP is enabled. A remote, unauthenticated attacker can send specially crafted requests to the server, causing it to make outbound requests to arbitrary internal or external resources. This can be used to bypass network firewalls, access internal services, or exfiltrate sensitive information. This vulnerability is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog.

Affected products

  • Synacor Zimbra Collaboration Suite (ZCS) Before 8.8.15 Patch 7

Timeline

  • 2020-02-18: disclosed: Initial NVD publication
  • 2020-02-18: patched: Fixed in 8.8.15 Patch 7
  • 2026-02-17: kev added: Added to CISA Known Exploited Vulnerabilities catalog

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