# CVE-2018-10939: Cross-site scripting in n/a

> Attackers can inject persistent scripts via contact groups in Zimbra Web Client, potentially stealing user sessions or executing malicious code.

- **Severity:** Medium 6.1 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 30 May 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-jwrc-jxj5-hqh2

## What is CVE-2018-10939?

CVE-2018-10939 is a medium-severity cross-site scripting vulnerability in Synacor Zimbra Collaboration Suite, published on 30 May 2018. 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

Zimbra Web Client (ZWC) in Zimbra Collaboration Suite 8.8 before 8.8.8.Patch4 and 8.7 before 8.7.11.Patch4 has Persistent XSS via a contact group.

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

## Which versions are affected by CVE-2018-10939?

It affects 2 products.


Products: Synacor Zimbra Collaboration Suite, Zimbra Zimbra Collaboration Suite.

## How do I fix CVE-2018-10939?

No fix has been published for CVE-2018-10939 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-10939 being exploited?

There is no known exploitation of CVE-2018-10939 in the wild and no public exploit code.

## 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-2018-10939 and fix it if it is affected.

What it is: CVE-2018-10939 is a medium-severity cross-site scripting vulnerability in Synacor Zimbra Collaboration Suite, published on 30 May 2018. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2018-10939 in the wild and no public exploit code.

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-2018-10939/ (Markdown: https://insights.sbomify.com/CVE-2018-10939/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-10939
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-10939
- OSV: https://osv.dev/vulnerability/CVE-2018-10939

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From sbomify Insights: https://insights.sbomify.com/CVE-2018-10939/
Summaries are generated and may contain mistakes; the official description above is the record.