CVE-2020-7796 Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery

Exploited in the wild Critical 9.8 Published 18 Feb 2020 Updated 18 Feb 2026

Attackers can exploit Server-Side Request Forgery in Zimbra when the WebEx zimlet is installed and JSP is enabled, potentially accessing internal resources.

Exploited in the wild: Since 17 Feb 2026
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-7796?

CVE-2020-7796 is a critical server-side request forgery vulnerability in Synacor Zimbra Collaboration Suite, published on 18 Feb 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7 allows SSRF when WebEx zimlet is installed and zimlet JSP is enabled.

Weakness: CWE-918

Which versions are affected by CVE-2020-7796?

It affects 1 product.

Products include Synacor Zimbra Collaboration Suite.

How do I fix CVE-2020-7796?

No fix has been published for CVE-2020-7796 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 10 Mar 2026.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2020-7796 being exploited?

Yes. Attackers have exploited CVE-2020-7796 in the wild since at least 17 Feb 2026.

Public exploit code: 1 Nuclei template.

All Synacor Zimbra Collaboration Suite vulnerabilities

Sources

Also known as GHSA-qfxw-56c6-7pjg.