# CVE-2019-15610: Missing authorization in Nextcloud Circles

> Attackers retain unauthorized access to circles after email removal due to improper authorization in the Nextcloud Circles app.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Feb 2020
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-5jc8-jgjw-38vr

## What is CVE-2019-15610?

CVE-2019-15610 is a medium-severity missing authorization vulnerability in Nextcloud Circles, published on 4 Feb 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Improper authorization in the Circles app 0.17.7 causes retaining access when an email address was removed from a circle.

Weakness: CWE-285 (Improper Authorization)

## Which versions are affected by CVE-2019-15610?

It affects 1 product.


Products: Nextcloud Circles.

## How do I fix CVE-2019-15610?

No fix has been published for CVE-2019-15610 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-15610 being exploited?

There is no known exploitation of CVE-2019-15610 in the wild and no public exploit code.

## Other vulnerabilities in Nextcloud Circles

- [CVE-2021-37630](https://insights.sbomify.com/CVE-2021-37630/): Secret Circle can be joined without approval in Nextcloud Circles (medium 6.5)
- [CVE-2021-32782](https://insights.sbomify.com/CVE-2021-32782/): Cross-Site Scripting in Nextcloud Circles (medium 5.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-15610 and fix it if it is affected.

What it is: CVE-2019-15610 is a medium-severity missing authorization vulnerability in Nextcloud Circles, published on 4 Feb 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-15610 in the wild and no public exploit code.

Affected product: Nextcloud Circles. 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-2019-15610/ (Markdown: https://insights.sbomify.com/CVE-2019-15610/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-15610
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-15610
- OSV: https://osv.dev/vulnerability/CVE-2019-15610

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-15610/
Summaries are generated and may contain mistakes; the official description above is the record.