# CVE-2023-3615: Lack of server certificate validation in websockets connection

> A network attacker can intercept WebSockets connections in the Mattermost iOS app due to missing server certificate validation.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Jul 2023
- **Updated:** 30 Oct 2024
- **Also known as:** GHSA-f56r-hfv8-q98c

## What is CVE-2023-3615?

CVE-2023-3615 is a high-severity vulnerability in Mattermost Mattermost, published on 17 Jul 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Mattermost iOS app fails to properly validate the server certificate while initializing the TLS connection allowing a network attacker to intercept the WebSockets connection.

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2023-3615?

It affects 1 product.


Products: Mattermost Mattermost.

## How do I fix CVE-2023-3615?

No fix has been published for CVE-2023-3615 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-3615 being exploited?

There is no known exploitation of CVE-2023-3615 in the wild and no public exploit code.

## Other vulnerabilities in Mattermost Mattermost

- [CVE-2019-20851](https://insights.sbomify.com/CVE-2019-20851/): Path traversal in n/a (critical 9.1)
- [CVE-2024-39274](https://insights.sbomify.com/CVE-2024-39274/): Malicious remote can add users to arbitrary teams and channels (high 8.7)
- [CVE-2024-39777](https://insights.sbomify.com/CVE-2024-39777/): Malicious remote can invite itself to an arbitrary local channel (high 8.7)
- [CVE-2024-39830](https://insights.sbomify.com/CVE-2024-39830/): Timing attack during remote cluster token comparison when shared channels are enabled (high 8.1)
- [CVE-2020-13891](https://insights.sbomify.com/CVE-2020-13891/): Information disclosure in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-3615 and fix it if it is affected.

What it is: CVE-2023-3615 is a high-severity vulnerability in Mattermost Mattermost, published on 17 Jul 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-3615 in the wild and no public exploit code.

Affected product: Mattermost Mattermost. 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-2023-3615/ (Markdown: https://insights.sbomify.com/CVE-2023-3615/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-3615
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-3615
- OSV: https://osv.dev/vulnerability/CVE-2023-3615

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-3615/
Summaries are generated and may contain mistakes; the official description above is the record.