# CVE-2023-5811: flusity CMS posts.php loadPostAddForm cross site scripting

> Remote attackers can execute arbitrary scripts via the menu_id parameter in flusity CMS, potentially leading to session hijacking or malicious actions.

- **Severity:** Low 2.4 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 27 Oct 2023
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-9962-6v6v-536h

## What is CVE-2023-5811?

CVE-2023-5811 is a low-severity cross-site scripting vulnerability in flusity CMS, published on 27 Oct 2023. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

A vulnerability, which was classified as problematic, was found in flusity CMS. Affected is the function loadPostAddForm of the file core/tools/posts.php. The manipulation of the argument menu_id leads to cross site scripting. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. Continious delivery with rolling releases is used by this product. Therefore, no version details of affected nor updated releases are available. The patch is identified as 6943991c62ed87c7a57989a0cb7077316127def8. It is recommended to apply a patch to fix this issue. VDB-243642 is the identifier assigned to this vulnerability.

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

## Which versions are affected by CVE-2023-5811?

It affects 1 product.


Products: Flusity Flusity.

## How do I fix CVE-2023-5811?

No fix has been published for CVE-2023-5811 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-5811 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-5811 exists.

## Other vulnerabilities in flusity CMS

- [CVE-2024-31666](https://insights.sbomify.com/CVE-2024-31666/): Code injection in n/a (critical 9.8)
- [CVE-2024-32418](https://insights.sbomify.com/CVE-2024-32418/): Code injection in n/a (critical 9.8)
- [CVE-2024-25502](https://insights.sbomify.com/CVE-2024-25502/): Path traversal in n/a (critical 9.8)
- [CVE-2024-23094](https://insights.sbomify.com/CVE-2024-23094/): Cross-site request forgery in n/a (high 8.8)
- [CVE-2024-26350](https://insights.sbomify.com/CVE-2024-26350/): Cross-site request forgery in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-5811 and fix it if it is affected.

What it is: CVE-2023-5811 is a low-severity cross-site scripting vulnerability in flusity CMS, published on 27 Oct 2023. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-5811 exists.

Affected product: flusity CMS. 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-2023-5811/ (Markdown: https://insights.sbomify.com/CVE-2023-5811/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-5811
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-5811
- OSV: https://osv.dev/vulnerability/CVE-2023-5811

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-5811/
Summaries are generated and may contain mistakes; the official description above is the record.