# CVE-2021-22912: Information disclosure in Nextcloud iOS app (it.twsweb.Nextcloud)

> Nextcloud iOS app leaks user data by querying a global lookup server during sharee searches instead of restricting to the local server.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 11 Jun 2021
- **Updated:** 3 Aug 2024
- **Also known as:** BIT-nextcloud-2021-22912, GHSA-m7w4-cvjr-76mh

## What is CVE-2021-22912?

CVE-2021-22912 is a medium-severity vulnerability in Nextcloud iOS app (it.twsweb.Nextcloud), published on 11 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Nextcloud iOS before 3.4.2 suffers from an information disclosure vulnerability when searches for sharees utilize the lookup server by default instead of only on the local Nextcloud server unless a global search has been explicitly chosen by the user.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2021-22912?

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


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `nextcloud` | Bitnami | All versions | 3.4.2 |

Products: Nextcloud Nextcloud.

## How do I fix CVE-2021-22912?

Upgrade nextcloud to 3.4.2 or later.

## Is CVE-2021-22912 being exploited?

There is no known exploitation of CVE-2021-22912 in the wild and no public exploit code.

## Other vulnerabilities in Nextcloud iOS app (it.twsweb.Nextcloud)

- [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-2021-22912 and fix it if it is affected.

What it is: CVE-2021-22912 is a medium-severity vulnerability in Nextcloud iOS app (it.twsweb.Nextcloud), published on 11 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-22912 in the wild and no public exploit code.

Affected packages and fixed versions:
- nextcloud (Bitnami): affected all versions; fixed in 3.4.2

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-2021-22912/ (Markdown: https://insights.sbomify.com/CVE-2021-22912/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22912
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22912
- OSV: https://osv.dev/vulnerability/CVE-2021-22912

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-22912/
Summaries are generated and may contain mistakes; the official description above is the record.