# CVE-2018-20758: MODX vulnerability allows for XSS via user settings parameters

> Cross-site scripting vulnerability in MODX Revolution allows attackers to inject malicious scripts via user settings, potentially compromising user sessions.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 6 Feb 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-vwqw-wfhv-2xcq

## What is CVE-2018-20758?

CVE-2018-20758 is a medium-severity cross-site scripting vulnerability in n/a, published on 6 Feb 2019. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

MODX Revolution through v2.7.0-pl allows XSS via User Settings such as Description.

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

## Which versions are affected by CVE-2018-20758?

2 open source packages ship an affected version, including modx/revolution. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `modx/revolution` | Packagist | All versions | 2.7.1-pl |
| `modx/revolution` | Packagist | All versions | 2.7.1-pl |

Products: Modx Modx Revolution.

## How do I fix CVE-2018-20758?

Upgrade modx/revolution to 2.7.1-pl or later.

## Is CVE-2018-20758 being exploited?

There is no known exploitation of CVE-2018-20758 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2017-7321](https://insights.sbomify.com/CVE-2017-7321/): Code injection in n/a (critical 9.8)
- [CVE-2017-7324](https://insights.sbomify.com/CVE-2017-7324/): Code injection in n/a (critical 9.8)
- [CVE-2020-25911](https://insights.sbomify.com/CVE-2020-25911/): XML External Entity vulnerability in MODX CMS (critical 9.1)
- [CVE-2017-9069](https://insights.sbomify.com/CVE-2017-9069/): MODX Revolution allows overwriting .htaccess (high 8.8)
- [CVE-2017-7322](https://insights.sbomify.com/CVE-2017-7322/): Weak cryptography in n/a (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-20758 and fix it if it is affected.

What it is: CVE-2018-20758 is a medium-severity cross-site scripting vulnerability in n/a, published on 6 Feb 2019. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2018-20758 in the wild and no public exploit code.

Affected packages and fixed versions:
- modx/revolution (Packagist): affected all versions; fixed in 2.7.1-pl
- modx/revolution (Packagist): affected all versions; fixed in 2.7.1-pl

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-2018-20758/ (Markdown: https://insights.sbomify.com/CVE-2018-20758/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-20758
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-20758
- OSV: https://osv.dev/vulnerability/CVE-2018-20758

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-20758/
Summaries are generated and may contain mistakes; the official description above is the record.