# CVE-2022-27926: Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS)

> Unauthenticated attackers can execute arbitrary scripts via reflected XSS in Zimbra Collaboration, potentially leading to account takeover.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Yes, since 3 Apr 2023 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 20 Apr 2022
- **Updated:** 21 Oct 2025
- **Also known as:** GHSA-chc6-9436-6wfq

## What is CVE-2022-27926?

CVE-2022-27926 is a medium-severity cross-site scripting vulnerability in Synacor Zimbra Collaboration Suite, published on 20 Apr 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A reflected cross-site scripting (XSS) vulnerability in the /public/launchNewWindow.jsp component of Zimbra Collaboration (aka ZCS) 9.0 allows unauthenticated attackers to execute arbitrary web script or HTML via request parameters.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2022-27926?

It affects 1 product.


Products: Synacor Zimbra Collaboration Suite.

## How do I fix CVE-2022-27926?

No fix has been published for CVE-2022-27926 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 24 Apr 2023.

## Is CVE-2022-27926 being exploited?

Yes. Attackers have exploited CVE-2022-27926 in the wild since at least 3 Apr 2023.

Public exploit code:

- Zimbra Collaboration (ZCS) - Cross Site Scripting (nuclei): http/cves/2022/CVE-2022-27926.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-2020-7796](https://insights.sbomify.com/CVE-2020-7796/): Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-27926 and fix it if it is affected.

What it is: CVE-2022-27926 is a medium-severity cross-site scripting vulnerability in Synacor Zimbra Collaboration Suite, published on 20 Apr 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: Yes. Attackers have exploited CVE-2022-27926 in the wild since at least 3 Apr 2023.

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-2022-27926/ (Markdown: https://insights.sbomify.com/CVE-2022-27926/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-27926
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-27926
- OSV: https://osv.dev/vulnerability/CVE-2022-27926

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From sbomify Insights: https://insights.sbomify.com/CVE-2022-27926/
Summaries are generated and may contain mistakes; the official description above is the record.