---
title: "CVE-2020-7796: Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery Vulnerability"
url: https://erroneo.us/security/cve/CVE-2020-7796/
description: "CVE-2020-7796 (Synacor Zimbra Collaboration Suite): Exploited in the wild (CISA KEV). Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7 allows SSRF…"
type: vulnerability-record
section: "Security Digest"
date_published: 2020-02-18
date_modified: 2026-02-18
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2020-7796"
kev: true
cvss: 9.8
epss: 0.84418
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Synacor Zimbra Collaboration Suite. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-02-17, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-03-10 ; treat that as the outer limit, not the target.
- EPSS 84.4% , percentile 99.7: FIRST’s model estimates a 84.4% chance of exploitation activity in the next 30 days, higher than 99.7% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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

## Affected products (CVE record)

- n/a n/a: see advisory

## Severity

- CISA-ADP CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2026-02-17; federal due date 2026-03-10. Known ransomware use: Unknown.
- CISA 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.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 84.42% probability of exploitation activity in the next 30 days; percentile 99.7.

## Sources

- [Listed in CISA KEV notes (wiki.zimbra.com)](https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P7)
- [CVE.org record CVE-2020-7796](https://www.cve.org/CVERecord?id=CVE-2020-7796)
- [NVD entry CVE-2020-7796](https://nvd.nist.gov/vuln/detail/CVE-2020-7796)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-7796)

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Source page: https://erroneo.us/security/cve/CVE-2020-7796/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt