# CVE-2023-6720: Cross-site Scripting in Repox

> A local attacker can inject malicious JavaScript into Repox due to insufficient input sanitization, leading to script execution when the application loads.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L`)
- **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:** 13 Dec 2023
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-3j5h-p2g7-9wc9

## What is CVE-2023-6720?

CVE-2023-6720 is a medium-severity cross-site scripting vulnerability in Repox, published on 13 Dec 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

An XSS vulnerability stored in Repox has been identified, which allows a local attacker to store a specially crafted JavaScript payload on the server, due to the lack of proper sanitisation of field elements, allowing the attacker to trigger the malicious payload when the application loads.

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

## Which versions are affected by CVE-2023-6720?

It affects 1 product.


Products: Europeana Repox.

## How do I fix CVE-2023-6720?

No fix has been published for CVE-2023-6720 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-6720 being exploited?

There is no known exploitation of CVE-2023-6720 in the wild and no public exploit code.

## Other vulnerabilities in Repox

- [CVE-2023-6723](https://insights.sbomify.com/CVE-2023-6723/): Unrestricted Upload of File with Dangerous Type in Repox (critical 10.0)
- [CVE-2023-6718](https://insights.sbomify.com/CVE-2023-6718/): Authentication Bypass Using an Alternate Path or Channel in Repox (critical 9.4)
- [CVE-2023-6721](https://insights.sbomify.com/CVE-2023-6721/): Improper Restriction of XML External Entity Reference in Repox (high 8.3)
- [CVE-2023-6722](https://insights.sbomify.com/CVE-2023-6722/): Relative Path Traversal in Repox (high 7.5)
- [CVE-2023-6719](https://insights.sbomify.com/CVE-2023-6719/): Cross-site Scripting in Repox (medium 6.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-6720 and fix it if it is affected.

What it is: CVE-2023-6720 is a medium-severity cross-site scripting vulnerability in Repox, published on 13 Dec 2023. 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-2023-6720 in the wild and no public exploit code.

Affected product: Repox. 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-2023-6720/ (Markdown: https://insights.sbomify.com/CVE-2023-6720/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-6720
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-6720
- OSV: https://osv.dev/vulnerability/CVE-2023-6720

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-6720/
Summaries are generated and may contain mistakes; the official description above is the record.