# CVE-2023-32320: Nextcloud Server's brute force protection allows someone to send more requests than intended

> Attackers can bypass brute force protection limits by sending parallel requests, allowing excessive attempts against protected details.

- **Severity:** High 8.7 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Jun 2023
- **Updated:** 5 Dec 2024
- **Also known as:** GHSA-qphh-6xh7-vffg

## What is CVE-2023-32320?

CVE-2023-32320 is a high-severity vulnerability in Nextcloud Nextcloud Server, published on 22 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Nextcloud Server is a data storage system for Nextcloud, a self-hosted productivity platform. When multiple requests are sent in parallel, all of them were executed even if the amount of faulty requests succeeded the limit by the time the response was sent to the client. This allowed someone to send as many requests the server could handle in parallel to bruteforce protected details instead of the configured limit, default 8. Nextcloud Server versions 25.0.7 and 26.0.2 and Nextcloud Enterprise Server versions 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7 and 26.0.2 contain patches for this issue.

Weakness: CWE-307 (Improper Restriction of Excessive Authentication Attempts)

## Which versions are affected by CVE-2023-32320?

It affects 1 product.


Products: Nextcloud Nextcloud Server.

## How do I fix CVE-2023-32320?

No fix has been published for CVE-2023-32320 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-32320 being exploited?

There is no known exploitation of CVE-2023-32320 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-2021-32656](https://insights.sbomify.com/CVE-2021-32656/): Trusted servers exchange can be triggered by attacker (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-32320 and fix it if it is affected.

What it is: CVE-2023-32320 is a high-severity vulnerability in Nextcloud Nextcloud Server, published on 22 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-32320 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-2023-32320/ (Markdown: https://insights.sbomify.com/CVE-2023-32320/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-32320
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-32320
- OSV: https://osv.dev/vulnerability/CVE-2023-32320

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-32320/
Summaries are generated and may contain mistakes; the official description above is the record.