# CVE-2024-37317: Nextcloud Notes app can be tricked into using a received share created before the user logged in

> Attackers can force new users to store personal notes in an attacker-controlled shared folder, leading to data exposure or modification.

- **Severity:** Medium 4.6 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 14 Jun 2024
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-wfqv-cx85-7rjx

## What is CVE-2024-37317?

CVE-2024-37317 is a medium-severity missing authorization vulnerability in nextcloud security-advisories, published on 14 Jun 2024. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

The Nextcloud Notes app is a distraction free notes taking app for Nextcloud. If an attacker managed to share a folder called `Notes/` with a newly created user before they logged in, the Notes app would use that folder store the personal notes. It is recommended that the Nextcloud Notes app is upgraded to 4.9.3.

Weakness: CWE-862 (Missing Authorization), CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2024-37317?

It affects 1 product.


Products: Nextcloud Notes.

## How do I fix CVE-2024-37317?

No fix has been published for CVE-2024-37317 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-37317 being exploited?

There is no known exploitation of CVE-2024-37317 in the wild and no public exploit code.

## Other vulnerabilities in nextcloud security-advisories

- [CVE-2023-39955](https://insights.sbomify.com/CVE-2023-39955/): Notes attachment render HTML in preview mode (low 3.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-37317 and fix it if it is affected.

What it is: CVE-2024-37317 is a medium-severity missing authorization vulnerability in nextcloud security-advisories, published on 14 Jun 2024. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2024-37317 in the wild and no public exploit code.

Affected product: nextcloud security-advisories. 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-2024-37317/ (Markdown: https://insights.sbomify.com/CVE-2024-37317/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-37317
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-37317
- OSV: https://osv.dev/vulnerability/CVE-2024-37317

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-37317/
Summaries are generated and may contain mistakes; the official description above is the record.