# CVE-2023-45660: Require strict cookies for image proxy requests in Nextcloud Mail

> Attackers can abuse the image proxy endpoint to cause denial of service on third-party servers due to missing origin and cookie checks.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L`)
- **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:** 16 Oct 2023
- **Updated:** 13 Sep 2024
- **Also known as:** GHSA-8j9x-fmww-qr37

## What is CVE-2023-45660?

CVE-2023-45660 is a medium-severity server-side request forgery vulnerability in nextcloud security-advisories, published on 16 Oct 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Nextcloud mail is an email app for the Nextcloud home server platform. In affected versions a missing check of origin, target and cookies allows for an attacker to abuse the proxy endpoint to denial of service a third server. It is recommended that the Nextcloud Mail is upgraded to 2.2.8 or 3.3.0. There are no known workarounds for this vulnerability.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2023-45660?

It affects 1 product.


Products: Nextcloud Mail.

## How do I fix CVE-2023-45660?

No fix has been published for CVE-2023-45660 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-45660 being exploited?

There is no known exploitation of CVE-2023-45660 in the wild and no public exploit code.

## Other vulnerabilities in nextcloud security-advisories

- [CVE-2021-32652](https://insights.sbomify.com/CVE-2021-32652/): Missing permission check on email metadata retrieval (high 8.8)
- [CVE-2022-31132](https://insights.sbomify.com/CVE-2022-31132/): Unauthenticated SSRF in 3rd party module "cerdic/csstidy" (high 8.3)
- [CVE-2024-52508](https://insights.sbomify.com/CVE-2024-52508/): Nextcloud Mail auto configurator can be tricked into sending account information to wrong servers (high 8.2)
- [CVE-2023-23943](https://insights.sbomify.com/CVE-2023-23943/): Blind SSRF via server URL input in the Nextcloud Mail app (medium 5.0)
- [CVE-2021-32707](https://insights.sbomify.com/CVE-2021-32707/): Bypass of image blocking in Nextcloud Mail (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-45660 and fix it if it is affected.

What it is: CVE-2023-45660 is a medium-severity server-side request forgery vulnerability in nextcloud security-advisories, published on 16 Oct 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-2023-45660 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-2023-45660/ (Markdown: https://insights.sbomify.com/CVE-2023-45660/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-45660
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-45660
- OSV: https://osv.dev/vulnerability/CVE-2023-45660

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-45660/
Summaries are generated and may contain mistakes; the official description above is the record.