# CVE-2025-66552: Nextcloud Server admin_audit does not log all actions on files in groupfolders

> Attackers can perform file actions in group folders without triggering admin audit logs, hiding malicious activity from administrators.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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:** Yes
- **Published:** 5 Dec 2025
- **Updated:** 5 Dec 2025
- **Also known as:** BIT-nextcloud-2025-66552, GHSA-ww9m-f8j4-jj9x

## What is CVE-2025-66552?

CVE-2025-66552 is a medium-severity vulnerability in Nextcloud Nextcloud Server, published on 5 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Enterprise Server prior to 30.0.9 and 31.0.1, incorrect path handling with groupfolders caused the admin_audit app to not properly log all actions on files and folders inside groupfolders. This vulnerability is fixed in Nextcloud Server and Enterprise Server prior to 30.0.9 and 31.0.1.

Weakness: CWE-778 (Insufficient Logging)

## Which versions are affected by CVE-2025-66552?

1 open source package ship an affected version, including nextcloud. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `nextcloud` | Bitnami | All versions | 31.0.9, 32.0.1 |

Products: Nextcloud Nextcloud Server.

## How do I fix CVE-2025-66552?

Upgrade nextcloud to a fixed version for your release line: 31.0.9 or 32.0.1.

## Is CVE-2025-66552 being exploited?

There is no known exploitation of CVE-2025-66552 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-2025-66552 and fix it if it is affected.

What it is: CVE-2025-66552 is a medium-severity vulnerability in Nextcloud Nextcloud Server, published on 5 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-66552 in the wild and no public exploit code.

Affected packages and fixed versions:
- nextcloud (Bitnami): affected all versions; fixed in 31.0.9, 32.0.1

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-2025-66552/ (Markdown: https://insights.sbomify.com/CVE-2025-66552/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-66552
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-66552
- OSV: https://osv.dev/vulnerability/CVE-2025-66552

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-66552/
Summaries are generated and may contain mistakes; the official description above is the record.