# CVE-2023-33182: Nextcloud Contacts photos only sanitized if mime type is all lower case

> Attackers could potentially execute scripts via unsanitized SVGs in Nextcloud Contacts if mime type casing is manipulated, though exploitation is currently deemed unlikely.

- **Severity:** Not scored
- **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:** 30 May 2023
- **Updated:** 10 Jan 2025
- **Also known as:** GHSA-hxr6-cx85-gcjx

## What is CVE-2023-33182?

CVE-2023-33182 is a cross-site scripting vulnerability in nextcloud security-advisories, published on 30 May 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Contacts app for Nextcloud easily syncs contacts from various devices with your Nextcloud and allows editing. The unsanitized SVG is converted to a JavaScript blob (in memory data) that the Avatar can't render. Due to this constellation the missing sanitization does not seem to be exploitable. It is recommended that the Contacts app is upgraded to 5.0.3 or 4.2.4

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2023-33182?

It affects 1 product.


Products: Nextcloud Contacts.

## How do I fix CVE-2023-33182?

No fix has been published for CVE-2023-33182 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-33182 being exploited?

There is no known exploitation of CVE-2023-33182 in the wild and no public exploit code.

## Other vulnerabilities in nextcloud security-advisories

- [CVE-2021-39221](https://insights.sbomify.com/CVE-2021-39221/): XSS in Contacts (medium 6.4)
- [CVE-2020-8280](https://insights.sbomify.com/CVE-2020-8280/): Cross-site scripting in Nextcloud Contacts (medium 5.4)
- [CVE-2020-8281](https://insights.sbomify.com/CVE-2020-8281/): Cross-site scripting in Nextcloud Contacts (medium 5.4)
- [CVE-2018-3764](https://insights.sbomify.com/CVE-2018-3764/): Cross-site scripting in Nextcloud Contacts application (medium 4.8)
- [CVE-2020-8181](https://insights.sbomify.com/CVE-2020-8181/): File upload in Nextcloud Contact (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-33182 and fix it if it is affected.

What it is: CVE-2023-33182 is a cross-site scripting vulnerability in nextcloud security-advisories, published on 30 May 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-33182 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-2023-33182/ (Markdown: https://insights.sbomify.com/CVE-2023-33182/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-33182
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-33182
- OSV: https://osv.dev/vulnerability/CVE-2023-33182

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-33182/
Summaries are generated and may contain mistakes; the official description above is the record.