# CVE-2023-26455: Missing authorization in OX App Suite

> Attackers with local or adjacent network access can modify calendar items via an unauthenticated RMI service in OX App Suite.

- **Severity:** Medium 5.6 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Nov 2023
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-9wv2-mrrp-v8g7

## What is CVE-2023-26455?

CVE-2023-26455 is a medium-severity missing authorization vulnerability in Open-Xchange Open-Xchange Appsuite, published on 2 Nov 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

RMI was not requiring authentication when calling ChronosRMIService:setEventOrganizer. Attackers with local or adjacent network access could abuse the RMI service to modify calendar items using RMI. RMI access is restricted to localhost by default. The interface has been updated to require authenticated requests. No publicly available exploits are known.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2023-26455?

It affects 1 product.


Products: Open-Xchange Open-Xchange Appsuite.

## How do I fix CVE-2023-26455?

No fix has been published for CVE-2023-26455 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-26455 being exploited?

There is no known exploitation of CVE-2023-26455 in the wild and no public exploit code.

## Other vulnerabilities in Open-Xchange Open-Xchange Appsuite

- [CVE-2017-13667](https://insights.sbomify.com/CVE-2017-13667/): Server-side request forgery in n/a (critical 9.9)
- [CVE-2020-12645](https://insights.sbomify.com/CVE-2020-12645/): Denial of service in n/a (critical 9.8)
- [CVE-2019-7158](https://insights.sbomify.com/CVE-2019-7158/): Missing authorization in n/a (critical 9.8)
- [CVE-2017-17060](https://insights.sbomify.com/CVE-2017-17060/): Misconfiguration in n/a (critical 9.8)
- [CVE-2017-5210](https://insights.sbomify.com/CVE-2017-5210/): Information disclosure in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-26455 and fix it if it is affected.

What it is: CVE-2023-26455 is a medium-severity missing authorization vulnerability in Open-Xchange Open-Xchange Appsuite, published on 2 Nov 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-26455 in the wild and no public exploit code.

Affected product: Open-Xchange Open-Xchange Appsuite. 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-2023-26455/ (Markdown: https://insights.sbomify.com/CVE-2023-26455/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-26455
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-26455
- OSV: https://osv.dev/vulnerability/CVE-2023-26455

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-26455/
Summaries are generated and may contain mistakes; the official description above is the record.