# CVE-2024-52510: Nextcloud Desktop client behaves incorrectly if the initial end-to-end-encryption signature is empty

> Attackers can bypass end-to-end encryption signature validation by sending an empty initial signature, compromising data integrity for Nextcloud Desktop Client users.

- **Severity:** Medium 4.2 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 15 Nov 2024
- **Updated:** 15 Nov 2024
- **Also known as:** DEBIAN-CVE-2024-52510, GHSA-r4qc-m9mj-452v, UBUNTU-CVE-2024-52510

## What is CVE-2024-52510?

CVE-2024-52510 is a medium-severity vulnerability in nextcloud security-advisories, published on 15 Nov 2024. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with your computer. The Desktop client did not stop with an error but allowed by-passing the signature validation, if a manipulated server sends an empty initial signature. It is recommended that the Nextcloud Desktop client is upgraded to 3.14.2 or later.

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2024-52510?

It affects 1 product.


Products: Nextcloud Desktop.

## How do I fix CVE-2024-52510?

Upgrade to a fixed version.

## Is CVE-2024-52510 being exploited?

There is no known exploitation of CVE-2024-52510 in the wild and no public exploit code.

Public exploit code:

- CVE-2024-52510 - Confidentiality Break in Nextcloud End to End Encryption (github_poc): https://github.com/d-xuan/CVE-2024-52510

## Other vulnerabilities in nextcloud security-advisories

- [CVE-2024-46958](https://insights.sbomify.com/CVE-2024-46958/): Misconfiguration in n/a (critical 9.1)
- [CVE-2020-8224](https://insights.sbomify.com/CVE-2020-8224/): Code injection in Desktop Client (high 7.8)
- [CVE-2020-8225](https://insights.sbomify.com/CVE-2020-8225/): Information disclosure in Desktop Client (high 7.5)
- [CVE-2021-37617](https://insights.sbomify.com/CVE-2021-37617/): Untrusted Search Path in Nextcloud Desktop Client (high 7.3)
- [CVE-2023-28999](https://insights.sbomify.com/CVE-2023-28999/): Nextcloud: Lack of authenticity of metadata keys allows a malicious server to gain access to E2EE folders (medium 6.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-52510 and fix it if it is affected.

What it is: CVE-2024-52510 is a medium-severity vulnerability in nextcloud security-advisories, published on 15 Nov 2024. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2024-52510 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-2024-52510/ (Markdown: https://insights.sbomify.com/CVE-2024-52510/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-52510
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-52510
- OSV: https://osv.dev/vulnerability/CVE-2024-52510

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-52510/
Summaries are generated and may contain mistakes; the official description above is the record.