# CVE-2021-43863: SQL Injection in FileContentProvider (GHSL-2021-1007)

> Malicious apps on the same device can exploit SQL injection to access Nextcloud data, bypassing permission controls.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 25 Jan 2022
- **Updated:** 23 Apr 2025
- **Also known as:** BIT-nextcloud-2021-43863, GHSA-vjp2-f63v-w479

## What is CVE-2021-43863?

CVE-2021-43863 is a high-severity SQL injection vulnerability in nextcloud android, published on 25 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Nextcloud Android app is the Android client for Nextcloud, a self-hosted productivity platform. The Nextcloud Android app uses content providers to manage its data. Prior to version 3.18.1, the providers `FileContentProvider` and `DiskLruImageCacheFileProvider` have security issues (an SQL injection, and an insufficient permission control, respectively) that allow malicious apps in the same device to access Nextcloud's data bypassing the permission control system. Users should upgrade to version 3.18.1 to receive a patch. There are no known workarounds aside from upgrading.

Weakness: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command)

## Which versions are affected by CVE-2021-43863?

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


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `nextcloud` | Bitnami | All versions | 3.18.1 |

Products: Nextcloud Nextcloud.

## How do I fix CVE-2021-43863?

Upgrade nextcloud to 3.18.1 or later.

## Is CVE-2021-43863 being exploited?

There is no known exploitation of CVE-2021-43863 in the wild and no public exploit code.

## Other vulnerabilities in nextcloud android

- [CVE-2019-5454](https://insights.sbomify.com/CVE-2019-5454/): SQL injection in com.nextcloud.client (critical 9.8)
- [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)
- [CVE-2021-22912](https://insights.sbomify.com/CVE-2021-22912/): Information disclosure in Nextcloud iOS app (it.twsweb.Nextcloud) (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-43863 and fix it if it is affected.

What it is: CVE-2021-43863 is a high-severity SQL injection vulnerability in nextcloud android, published on 25 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-43863 in the wild and no public exploit code.

Affected packages and fixed versions:
- nextcloud (Bitnami): affected all versions; fixed in 3.18.1

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-2021-43863/ (Markdown: https://insights.sbomify.com/CVE-2021-43863/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-43863
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-43863
- OSV: https://osv.dev/vulnerability/CVE-2021-43863

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-43863/
Summaries are generated and may contain mistakes; the official description above is the record.