# CVE-2018-6842: Cross-site scripting in n/a

> An attacker can execute arbitrary scripts in a victim's browser via a crafted URL in Kentico CMS, potentially leading to session hijacking.

- **Severity:** Medium 5.4 (`CVSS:3.0/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:** No
- **Published:** 19 Mar 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-xc9c-j8fw-874p

## What is CVE-2018-6842?

CVE-2018-6842 is a medium-severity cross-site scripting vulnerability in Kentico Xperience, published on 19 Mar 2018. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Kentico 10 before 10.0.50 and 11 before 11.0.3 has XSS in which a crafted URL results in improper construction of a system page.

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

## Which versions are affected by CVE-2018-6842?

It affects 1 product.


Products: Kentico Xperience.

## How do I fix CVE-2018-6842?

No fix has been published for CVE-2018-6842 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-6842 being exploited?

There is no known exploitation of CVE-2018-6842 in the wild and no public exploit code.

## Other vulnerabilities in Kentico Xperience

- [CVE-2025-2746](https://insights.sbomify.com/CVE-2025-2746/): Kentico Xperience CMS Authentication Bypass Using an Alternate Path or Channel (critical 9.8, exploited in the wild)
- [CVE-2025-2747](https://insights.sbomify.com/CVE-2025-2747/): Kentico Xperience CMS Authentication Bypass Using an Alternate Path or Channel (critical 9.8, exploited in the wild)
- [CVE-2019-10068](https://insights.sbomify.com/CVE-2019-10068/): Kentico Xperience Deserialization of Untrusted Data (critical 9.8, exploited in the wild)
- [CVE-2025-2749](https://insights.sbomify.com/CVE-2025-2749/): Kentico Xperience Path Traversal (high 7.2, exploited in the wild)
- [CVE-2017-17736](https://insights.sbomify.com/CVE-2017-17736/): Missing authorization in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-6842 and fix it if it is affected.

What it is: CVE-2018-6842 is a medium-severity cross-site scripting vulnerability in Kentico Xperience, published on 19 Mar 2018. 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-2018-6842 in the wild and no public exploit code.

Affected product: Kentico Xperience. 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-2018-6842/ (Markdown: https://insights.sbomify.com/CVE-2018-6842/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-6842
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-6842
- OSV: https://osv.dev/vulnerability/CVE-2018-6842

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-6842/
Summaries are generated and may contain mistakes; the official description above is the record.