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

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

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Yes, since 17 Feb 2026 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Feb 2020
- **Updated:** 18 Feb 2026
- **Also known as:** GHSA-qfxw-56c6-7pjg

## 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 (Server-Side Request Forgery)

## Which versions are affected by CVE-2020-7796?

It affects 1 product.


Products: 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.

## 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:

- Zimbra Collaboration Suite < 8.8.15 Patch 7 - Server-Side Request Forgery (nuclei): http/cves/2020/CVE-2020-7796.yaml

## Other vulnerabilities in Synacor Zimbra Collaboration Suite

- [CVE-2024-45519](https://insights.sbomify.com/CVE-2024-45519/): Synacor Zimbra Collaboration Suite (ZCS) Command Execution (critical 10.0, exploited in the wild)
- [CVE-2022-41352](https://insights.sbomify.com/CVE-2022-41352/): Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload (critical 9.8, exploited in the wild)
- [CVE-2022-37042](https://insights.sbomify.com/CVE-2022-37042/): Synacor Zimbra Collaboration Suite (ZCS) Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2022-27924](https://insights.sbomify.com/CVE-2022-27924/): Synacor Zimbra Collaboration Suite (ZCS) Command Injection (critical 9.8, exploited in the wild)
- [CVE-2019-9670](https://insights.sbomify.com/CVE-2019-9670/): Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Reference (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-7796 and fix it if it is affected.

What it is: 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.
Exploitation: Yes. Attackers have exploited CVE-2020-7796 in the wild since at least 17 Feb 2026.

Affected product: Synacor Zimbra Collaboration Suite. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-7796/ (Markdown: https://insights.sbomify.com/CVE-2020-7796/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-7796
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-7796
- OSV: https://osv.dev/vulnerability/CVE-2020-7796

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-7796/
Summaries are generated and may contain mistakes; the official description above is the record.