# CVE-2019-3639: MWG UI: Cross-Frame Scripting vulnerability

> Remote attackers can perform clickjacking attacks on the McAfee Web Gateway admin console due to missing X-Frame-Options headers.

- **Severity:** High 7.1 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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:** 14 Aug 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-xc8j-x355-h9cr

## What is CVE-2019-3639?

CVE-2019-3639 is a high-severity vulnerability in McAfee, LLC McAfee Web Gateway (MWG), published on 14 Aug 2019. 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

Clickjack vulnerability in Adminstrator web console in McAfee Web Gateway (MWG) 7.8.2.x prior to 7.8.2.12 allows remote attackers to conduct clickjacking attacks via a crafted web page that contains an iframe via does not send an X-Frame-Options HTTP header.

Weakness: CWE-1021 (Improper Restriction of Rendered UI Layers or Frames)

## Which versions are affected by CVE-2019-3639?

It affects 1 product.


Products: Mcafee Web Gateway.

## How do I fix CVE-2019-3639?

No fix has been published for CVE-2019-3639 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-3639 being exploited?

There is no known exploitation of CVE-2019-3639 in the wild and no public exploit code.

## Other vulnerabilities in McAfee, LLC McAfee Web Gateway (MWG)

- [CVE-2021-23885](https://insights.sbomify.com/CVE-2021-23885/): Privilege escalation vulnerability in McAfee Web Gateway (MWG) UI (critical 9.0)
- [CVE-2020-7293](https://insights.sbomify.com/CVE-2020-7293/): Web Gateway (MWG) - Privilege Escalation vulnerability (critical 9.0)
- [CVE-2019-3638](https://insights.sbomify.com/CVE-2019-3638/): Web Gateway (MWG) - Reflected Cross Site Scripting vulnerability (high 8.1)
- [CVE-2022-1254](https://insights.sbomify.com/CVE-2022-1254/): SWG URL redirection vulnerability (medium 6.1)
- [CVE-2020-7296](https://insights.sbomify.com/CVE-2020-7296/): Web Gateway (MWG) - Privilege Escalation vulnerability (medium 5.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-3639 and fix it if it is affected.

What it is: CVE-2019-3639 is a high-severity vulnerability in McAfee, LLC McAfee Web Gateway (MWG), published on 14 Aug 2019. 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-2019-3639 in the wild and no public exploit code.

Affected product: McAfee, LLC McAfee Web Gateway (MWG). 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-2019-3639/ (Markdown: https://insights.sbomify.com/CVE-2019-3639/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-3639
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-3639
- OSV: https://osv.dev/vulnerability/CVE-2019-3639

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-3639/
Summaries are generated and may contain mistakes; the official description above is the record.