# CVE-2019-3591: DLP Endpoint ePO extension vulnerable to XSS

> Unauthenticated attackers can trigger stored XSS in the ePO UI via crafted uploads, potentially compromising administrator accounts.

- **Severity:** Low 3.9 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 24 Jul 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-59jw-h7c8-p754

## What is CVE-2019-3591?

CVE-2019-3591 is a low-severity cross-site scripting vulnerability in McAfee, LLC Data Loss Prevention ePO extension, published on 24 Jul 2019. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in ePO extension in McAfee Data Loss Prevention (DLPe) for Windows 11.x prior to 11.3.0 allows unauthenticated remote user to trigger specially crafted JavaScript to render in the ePO UI via a carefully crafted upload to a remote website which is correctly blocked by DLPe Web Protection. This would then render as an XSS when the DLP Admin viewed the event in the ePO UI.

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

## Which versions are affected by CVE-2019-3591?

It affects 1 product.


Products: Mcafee Data Loss Prevention Endpoint.

## How do I fix CVE-2019-3591?

No fix has been published for CVE-2019-3591 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-3591 being exploited?

There is no known exploitation of CVE-2019-3591 in the wild and no public exploit code.

## Other vulnerabilities in McAfee, LLC Data Loss Prevention ePO extension

- [CVE-2021-31848](https://insights.sbomify.com/CVE-2021-31848/): Data Loss Prevention (DLP) ePO extension - Cross site scripting (XSS) (high 8.4)
- [CVE-2021-31849](https://insights.sbomify.com/CVE-2021-31849/): Data Loss Prevention (DLP) ePO extension - SQL injection (high 8.4)
- [CVE-2021-31844](https://insights.sbomify.com/CVE-2021-31844/): Local Privilege Escalation in McAfee DLP Endpoint for Windows (high 8.2)
- [CVE-2021-23887](https://insights.sbomify.com/CVE-2021-23887/): Privilege escalation in McAfee DLP Endpoint for Windows (high 7.8)
- [CVE-2016-8012](https://insights.sbomify.com/CVE-2016-8012/): Privilege escalation in Data Loss Prevention Endpoint (DLPe) (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-3591 and fix it if it is affected.

What it is: CVE-2019-3591 is a low-severity cross-site scripting vulnerability in McAfee, LLC Data Loss Prevention ePO extension, published on 24 Jul 2019. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-3591 in the wild and no public exploit code.

Affected product: McAfee, LLC Data Loss Prevention ePO extension. 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-2019-3591/ (Markdown: https://insights.sbomify.com/CVE-2019-3591/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-3591
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-3591
- OSV: https://osv.dev/vulnerability/CVE-2019-3591

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-3591/
Summaries are generated and may contain mistakes; the official description above is the record.