CVE-2020-7796

CRITICAL9.8

CISA KEV

Published 2020-02-18 · Updated 2026-06-17 · Source cve@mitre.org

Summary

CVE-2020-7796 is a critical-severity (CVSS 9.8) vulnerability in Synacor Zimbra Collaboration Suite. CISA added it to the Known Exploited Vulnerabilities catalog on February 17, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by March 10, 2026. CISA does not currently list it as used in ransomware campaigns. Synacor has 19 vulnerabilities in the KEV catalog, 6 of them linked to ransomware.

All 19 known-exploited Synacor vulnerabilities →

Description

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

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-918CWE-918

CISA Known-Exploited Vulnerability

Product: Synacor — Zimbra Collaboration Suite

Name: Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery Vulnerability

Date added: 2026-02-17 · Due: 2026-03-10

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

References

View on NVD

More exploited Synacor vulnerabilities

Most recently added to CISA KEV

CVE-2026-73570
Zimbra Collaboration Suite (ZCS) — Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability
added 2026-08-21
CVE-2025-48700
Zimbra Collaboration Suite (ZCS) — Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability
added 2026-04-20
CVE-2025-66376
Zimbra Collaboration Suite (ZCS) — Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability
added 2026-03-18
CVE-2025-68645
Zimbra Collaboration Suite (ZCS) — Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerability
added 2026-01-22
CVE-2025-27915
Zimbra Collaboration Suite (ZCS) — Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability
added 2025-10-07
CVE-2019-9621
Zimbra Collaboration Suite (ZCS) — Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (SSRF) Vulnerability
added 2025-07-07

View all →

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