# CVE-2020-15516: Cross-Site Request Forgery in mm_forum

> Cross-site scripting in the mm_forum extension for TYPO3 allows attackers to inject malicious scripts via CSRF, potentially compromising user sessions.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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:** No
- **Published:** 7 Jul 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-r67m-52qx-gfgc

## What is CVE-2020-15516?

CVE-2020-15516 is a medium-severity cross-site scripting vulnerability in n/a, published on 7 Jul 2020. 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

The mm_forum extension through 1.9.5 for TYPO3 allows XSS that can be exploited via CSRF.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation), CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2020-15516?

It affects 1 product.


Products: Mm Forum Project Mm Forum.

## How do I fix CVE-2020-15516?

No fix has been published for CVE-2020-15516 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-15516 being exploited?

There is no known exploitation of CVE-2020-15516 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2014-6298](https://insights.sbomify.com/CVE-2014-6298/): File upload in n/a (high 7.5)
- [CVE-2014-6299](https://insights.sbomify.com/CVE-2014-6299/): Cross-site request forgery in n/a (medium 6.8)
- [CVE-2014-6297](https://insights.sbomify.com/CVE-2014-6297/): Cross-site scripting in n/a (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-15516 and fix it if it is affected.

What it is: CVE-2020-15516 is a medium-severity cross-site scripting vulnerability in n/a, published on 7 Jul 2020. 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-2020-15516 in the wild and no public exploit code.

Affected product: n/a. 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-2020-15516/ (Markdown: https://insights.sbomify.com/CVE-2020-15516/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-15516
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-15516
- OSV: https://osv.dev/vulnerability/CVE-2020-15516

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-15516/
Summaries are generated and may contain mistakes; the official description above is the record.