# CVE-2023-49790: App PIN code can be bypassed in Nextcloud Files iOS

> Attackers can bypass the PIN code lock in the Nextcloud iOS Files app to access protected data without authentication.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 22 Dec 2023
- **Updated:** 2 Aug 2024
- **Also known as:** BIT-nextcloud-2023-49790, GHSA-j8g7-88vv-rggv

## What is CVE-2023-49790?

CVE-2023-49790 is a medium-severity authentication bypass vulnerability in nextcloud security-advisories, published on 22 Dec 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The Nextcloud iOS Files app allows users of iOS to interact with Nextcloud, a self-hosted productivity platform. Prior to version 4.9.2, the application can be used without providing the 4 digit PIN code. Nextcloud iOS Files app should be upgraded to 4.9.2 to receive the patch. No known workarounds are available.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2023-49790?

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


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `nextcloud` | Bitnami | All versions | 4.9.2 |

Products: Nextcloud Nextcloud.

## How do I fix CVE-2023-49790?

Upgrade nextcloud to 4.9.2 or later.

## Is CVE-2023-49790 being exploited?

There is no known exploitation of CVE-2023-49790 in the wild and no public exploit code.

## Other vulnerabilities in nextcloud security-advisories

- [CVE-2019-5454](https://insights.sbomify.com/CVE-2019-5454/): SQL injection in com.nextcloud.client (critical 9.8)
- [CVE-2021-43863](https://insights.sbomify.com/CVE-2021-43863/): SQL Injection in FileContentProvider (GHSL-2021-1007) (high 7.5)
- [CVE-2019-5450](https://insights.sbomify.com/CVE-2019-5450/): Cross-site scripting in com.nextcloud.client (medium 6.8)
- [CVE-2019-5455](https://insights.sbomify.com/CVE-2019-5455/): Auth bypass in com.nextcloud.client (medium 6.8)
- [CVE-2021-22905](https://insights.sbomify.com/CVE-2021-22905/): Information disclosure in Nextcloud Android App (com.nextcloud.client) (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-49790 and fix it if it is affected.

What it is: CVE-2023-49790 is a medium-severity authentication bypass vulnerability in nextcloud security-advisories, published on 22 Dec 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-49790 in the wild and no public exploit code.

Affected packages and fixed versions:
- nextcloud (Bitnami): affected all versions; fixed in 4.9.2

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-2023-49790/ (Markdown: https://insights.sbomify.com/CVE-2023-49790/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-49790
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-49790
- OSV: https://osv.dev/vulnerability/CVE-2023-49790

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-49790/
Summaries are generated and may contain mistakes; the official description above is the record.