# CVE-2023-45151: OAuth2 client_secret stored in plain text in the Nextcloud database

> Nextcloud stored OAuth2 client secrets in plaintext, allowing attackers with server access to potentially elevate privileges.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Oct 2023
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-hhgv-jcg9-p4m9

## What is CVE-2023-45151?

CVE-2023-45151 is a medium-severity vulnerability in Nextcloud Nextcloud Server, published on 16 Oct 2023. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Nextcloud server is an open source home cloud platform. Affected versions of Nextcloud stored OAuth2 tokens in plaintext which allows an attacker who has gained access to the server to potentially elevate their privilege. This issue has been addressed and users are recommended to upgrade their Nextcloud Server to version 25.0.8, 26.0.3 or 27.0.1. There are no known workarounds for this vulnerability.

Weakness: CWE-312 (Cleartext Storage of Sensitive Information)

## Which versions are affected by CVE-2023-45151?

It affects 1 product.


Products: Nextcloud Nextcloud Server.

## How do I fix CVE-2023-45151?

No fix has been published for CVE-2023-45151 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-45151 being exploited?

There is no known exploitation of CVE-2023-45151 in the wild and no public exploit code.

## Other vulnerabilities in Nextcloud Nextcloud Server

- [CVE-2021-32802](https://insights.sbomify.com/CVE-2021-32802/): Preview generation used third-party library not suited for user-generated content in Nextcloud server (critical 9.3)
- [CVE-2023-26482](https://insights.sbomify.com/CVE-2023-26482/): Scope of workflow operations is not validated in nextcloud server (critical 9.1)
- [CVE-2018-3775](https://insights.sbomify.com/CVE-2018-3775/): Auth bypass in Nextcloud Server (high 8.8)
- [CVE-2023-35172](https://insights.sbomify.com/CVE-2023-35172/): Nextcloud Server password reset endpoint is not brute force protected (high 8.7)
- [CVE-2023-32320](https://insights.sbomify.com/CVE-2023-32320/): Nextcloud Server's brute force protection allows someone to send more requests than intended (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-45151 and fix it if it is affected.

What it is: CVE-2023-45151 is a medium-severity vulnerability in Nextcloud Nextcloud Server, published on 16 Oct 2023. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-45151 in the wild and no public exploit code.

Affected product: Nextcloud Nextcloud Server. 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-2023-45151/ (Markdown: https://insights.sbomify.com/CVE-2023-45151/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-45151
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-45151
- OSV: https://osv.dev/vulnerability/CVE-2023-45151

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-45151/
Summaries are generated and may contain mistakes; the official description above is the record.