# CVE-2025-47793: Nextcloud Server and Groupfolders app vulnerable to bypass of group folder quota limit using attachment in text file

> Logged-in users can bypass group folder quota limits by uploading attachments in text files, allowing unauthorized storage consumption.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/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:** 16 May 2025
- **Updated:** 16 May 2025
- **Also known as:** GHSA-qqgg-hhfq-vhww

## What is CVE-2025-47793?

CVE-2025-47793 is a medium-severity vulnerability in Nextcloud Nextcloud Server, published on 16 May 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, and the Nextcloud Groupfolders app provides admin-configured folders shared by everyone in a group or team. In Nextcloud Server prior to 30.0.2, 29.0.9, and 28.0.1, Nextcloud Enterprise Server prior to 30.0.2 and 29.0.9, and Nextcloud Groupfolders app prior to 18.0.3, 17.0.5, and 16.0.11, the absence of quota checking on attachments allowed logged-in users to upload files exceeding the group folder quota. Nextcloud Server versions 30.0.2 and 29.0.9, Nextcloud Enterprise Server versions 30.0.2, 29.0.9, or 28.0.12, and Nextcloud Groupfolders app 18.0.3, 17.0.5, and 16.0.11 fix the issue. No known workarounds are available.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2025-47793?

It affects 2 products.


Products: Nextcloud Group Folders, Nextcloud Nextcloud Server.

## How do I fix CVE-2025-47793?

No fix has been published for CVE-2025-47793 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-47793 being exploited?

There is no known exploitation of CVE-2025-47793 in the wild and no public exploit code.

## Other vulnerabilities in Nextcloud Nextcloud Server

- [CVE-2025-66545](https://insights.sbomify.com/CVE-2025-66545/): Nextcloud Groupfolders users with read-only permissions for team folder can restore deleted files from trash bin (low 3.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-47793 and fix it if it is affected.

What it is: CVE-2025-47793 is a medium-severity vulnerability in Nextcloud Nextcloud Server, published on 16 May 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-2025-47793 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-2025-47793/ (Markdown: https://insights.sbomify.com/CVE-2025-47793/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-47793
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-47793
- OSV: https://osv.dev/vulnerability/CVE-2025-47793

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-47793/
Summaries are generated and may contain mistakes; the official description above is the record.