# CVE-2018-14840: Subrion CMS Cross-site Scripting

> Attackers can upload malicious HTML files to execute scripts in the context of other users, potentially leading to session hijacking or site defacement.

- **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:** Yes
- **Published:** 2 Aug 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-vhqr-3gr2-7px9

## What is CVE-2018-14840?

CVE-2018-14840 is a medium-severity cross-site scripting vulnerability in n/a, published on 2 Aug 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

uploads/.htaccess in Subrion CMS 4.2.1 allows XSS because it does not block .html file uploads (but does block, for example, .htm file uploads).

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

## Which versions are affected by CVE-2018-14840?

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


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `intelliants/subrion` | Packagist | All versions | 4.2.2 |
| `intelliants/subrion` | Packagist | All versions | 4.2.2 |

Products: Intelliants Subrion.

## How do I fix CVE-2018-14840?

Upgrade intelliants/subrion to 4.2.2 or later.

## Is CVE-2018-14840 being exploited?

There is no known exploitation of CVE-2018-14840 in the wild and no public exploit code.

Public exploit code:

- Subrion CMS 4.2.1 - Cross-Site Scripting (exploitdb)

## Other vulnerabilities in n/a

- [CVE-2024-25400](https://insights.sbomify.com/CVE-2024-25400/): SQL injection in n/a (critical 9.8)
- [CVE-2020-18155](https://insights.sbomify.com/CVE-2020-18155/): SQL Injection in Subrion CMS (critical 9.8)
- [CVE-2017-5543](https://insights.sbomify.com/CVE-2017-5543/): Subrion CMS PHP Object Injection (critical 9.8)
- [CVE-2023-46947](https://insights.sbomify.com/CVE-2023-46947/): Subrion remote command execution vulnerability (high 8.8)
- [CVE-2018-21037](https://insights.sbomify.com/CVE-2018-21037/): Subrion CMS CSRF Vulnerability (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-14840 and fix it if it is affected.

What it is: CVE-2018-14840 is a medium-severity cross-site scripting vulnerability in n/a, published on 2 Aug 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-2018-14840 in the wild and no public exploit code.

Affected packages and fixed versions:
- intelliants/subrion (Packagist): affected all versions; fixed in 4.2.2
- intelliants/subrion (Packagist): affected all versions; fixed in 4.2.2

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-2018-14840/ (Markdown: https://insights.sbomify.com/CVE-2018-14840/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-14840
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-14840
- OSV: https://osv.dev/vulnerability/CVE-2018-14840

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-14840/
Summaries are generated and may contain mistakes; the official description above is the record.