# CVE-2024-23336: Incomplete disallowed remote addresses list in MyBB

> Incomplete default IP blocklist in MyBB allows Server-Side Request Forgery, enabling attackers to access internal resources.

- **Severity:** Medium 5.0 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/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:** Not needed
- **Fix available:** No
- **Published:** 1 May 2024
- **Updated:** 1 Aug 2024
- **Also known as:** GHSA-qfrj-65mv-h75h

## What is CVE-2024-23336?

CVE-2024-23336 is a medium-severity server-side request forgery vulnerability in Mybb Mybb, published on 1 May 2024. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

MyBB is a free and open source forum software. The default list of disallowed remote hosts does not contain the `127.0.0.0/8` block, which may result in a Server-Side Request Forgery (SSRF) vulnerability. The Configuration File's _Disallowed Remote Addresses_ list (`$config['disallowed_remote_addresses']`) contains the address `127.0.0.1`, but does not include the complete block `127.0.0.0/8`. MyBB 1.8.38 resolves this issue in default installations. Administrators of installed boards should update the existing configuration (`inc/config.php`) to include all addresses blocked by default. Additionally, users are advised to verify that it includes any other IPv4 addresses resolving to the server and other internal resources. Users unable to upgrade may manually add 127.0.0.0/8' to their disallowed address list.

Weakness: CWE-918 (Server-Side Request Forgery), CWE-184 (Incomplete List of Disallowed Inputs)

## Which versions are affected by CVE-2024-23336?

It affects 1 product.


Products: Mybb Mybb.

## How do I fix CVE-2024-23336?

No fix has been published for CVE-2024-23336 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-23336 being exploited?

There is no known exploitation of CVE-2024-23336 in the wild and no public exploit code.

## Other vulnerabilities in Mybb Mybb

- [CVE-2011-10018](https://insights.sbomify.com/CVE-2011-10018/): myBB 1.6.4 Backdoor Arbitrary Command Execution (critical 10.0)
- [CVE-2015-2786](https://insights.sbomify.com/CVE-2015-2786/): Information disclosure in n/a (critical 10.0)
- [CVE-2011-5133](https://insights.sbomify.com/CVE-2011-5133/): Cross-site scripting in n/a (critical 10.0)
- [CVE-2006-0218](https://insights.sbomify.com/CVE-2006-0218/): SQL injection in n/a (critical 10.0)
- [CVE-2020-22612](https://insights.sbomify.com/CVE-2020-22612/): Code injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-23336 and fix it if it is affected.

What it is: CVE-2024-23336 is a medium-severity server-side request forgery vulnerability in Mybb Mybb, published on 1 May 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-23336 in the wild and no public exploit code.

Affected product: Mybb Mybb. 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-2024-23336/ (Markdown: https://insights.sbomify.com/CVE-2024-23336/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-23336
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-23336
- OSV: https://osv.dev/vulnerability/CVE-2024-23336

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-23336/
Summaries are generated and may contain mistakes; the official description above is the record.