# CVE-2021-32782: Cross-Site Scripting in Nextcloud Circles

> Stored XSS in Nextcloud Circles allows code execution in browsers lacking CSP support, such as Internet Explorer.

- **Severity:** Medium 5.8 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 7 Sep 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-hgpq-28gj-jrj9

## What is CVE-2021-32782?

CVE-2021-32782 is a medium-severity cross-site scripting vulnerability in nextcloud security-advisories, published on 7 Sep 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Nextcloud Circles is an open source social network built for the nextcloud ecosystem. In affected versions the Nextcloud Circles application is vulnerable to a stored Cross-Site Scripting (XSS) vulnerability. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. It is recommended that the Nextcloud Circles application is upgraded to 0.21.3, 0.20.10 or 0.19.14 to resolve this issue. As a workaround users may use a browser that has support for Content-Security-Policy. A notable exemption is Internet Explorer which does not support CSP properly.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2021-32782?

It affects 1 product.


Products: Nextcloud Circles.

## How do I fix CVE-2021-32782?

No fix has been published for CVE-2021-32782 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-32782 being exploited?

There is no known exploitation of CVE-2021-32782 in the wild and no public exploit code.

## Other vulnerabilities in nextcloud security-advisories

- [CVE-2021-37630](https://insights.sbomify.com/CVE-2021-37630/): Secret Circle can be joined without approval in Nextcloud Circles (medium 6.5)
- [CVE-2019-15610](https://insights.sbomify.com/CVE-2019-15610/): Missing authorization in Nextcloud Circles (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-32782 and fix it if it is affected.

What it is: CVE-2021-32782 is a medium-severity cross-site scripting vulnerability in nextcloud security-advisories, published on 7 Sep 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-32782 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-2021-32782/ (Markdown: https://insights.sbomify.com/CVE-2021-32782/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-32782
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-32782
- OSV: https://osv.dev/vulnerability/CVE-2021-32782

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-32782/
Summaries are generated and may contain mistakes; the official description above is the record.