# CVE-2023-26431: Server-side request forgery in OX App Suite

> Authenticated attackers can bypass deny-lists via IPv4-mapped IPv6 addresses to access restricted network infrastructure and reveal topology.

- **Severity:** Medium 5.0 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N`)
- **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:** 20 Jun 2023
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-fqgf-87c4-qvqm

## What is CVE-2023-26431?

CVE-2023-26431 is a medium-severity server-side request forgery vulnerability in OX App Suite, published on 20 Jun 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

IPv4-mapped IPv6 addresses did not get recognized as "local" by the code and a connection attempt is made. Attackers with access to user accounts could use this to bypass existing deny-list functionality and trigger requests to restricted network infrastructure to gain insight about topology and running services. We now respect possible IPV4-mapped IPv6 addresses when checking if contained in a deny-list. No publicly available exploits are known.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2023-26431?

It affects 1 product.


Products: Open-Xchange Open-Xchange Appsuite Backend.

## How do I fix CVE-2023-26431?

No fix has been published for CVE-2023-26431 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-26431 being exploited?

There is no known exploitation of CVE-2023-26431 in the wild and no public exploit code.

## Other vulnerabilities in OX App Suite

- [CVE-2023-26451](https://insights.sbomify.com/CVE-2023-26451/): Weak cryptography in OX App Suite (high 7.5)
- [CVE-2023-26436](https://insights.sbomify.com/CVE-2023-26436/): Deserialization in OX App Suite (high 7.1)
- [CVE-2023-26428](https://insights.sbomify.com/CVE-2023-26428/): Missing authorization in OX App Suite (medium 6.5)
- [CVE-2023-26443](https://insights.sbomify.com/CVE-2023-26443/): SQL injection in OX App Suite (medium 5.5)
- [CVE-2023-26435](https://insights.sbomify.com/CVE-2023-26435/): Server-side request forgery in OX App Suite (medium 5.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-26431 and fix it if it is affected.

What it is: CVE-2023-26431 is a medium-severity server-side request forgery vulnerability in OX App Suite, published on 20 Jun 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-26431 in the wild and no public exploit code.

Affected product: OX App Suite. 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-2023-26431/ (Markdown: https://insights.sbomify.com/CVE-2023-26431/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-26431
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-26431
- OSV: https://osv.dev/vulnerability/CVE-2023-26431

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-26431/
Summaries are generated and may contain mistakes; the official description above is the record.