# CVE-2024-43813: IDOR when marking read a user's channel

> Authenticated users can mark any channel as read for any other user due to missing access controls, allowing unauthorized state modification.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/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:** 22 Aug 2024
- **Updated:** 22 Aug 2024
- **Also known as:** GHSA-p433-57hw-rf68

## What is CVE-2024-43813?

CVE-2024-43813 is a medium-severity missing authorization vulnerability in Mattermost Mattermost, published on 22 Aug 2024. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Mattermost versions 9.5.x <= 9.5.7, 9.10.x <= 9.10.0 fail to enforce proper access controls which allows any authenticated user, including guests, to mark any channel inside any team as read for any user.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2024-43813?

It affects 1 product.


Products: Mattermost Mattermost.

## How do I fix CVE-2024-43813?

No fix has been published for CVE-2024-43813 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-43813 being exploited?

There is no known exploitation of CVE-2024-43813 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-2023-3615](https://insights.sbomify.com/CVE-2023-3615/): Lack of server certificate validation in websockets connection (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-43813 and fix it if it is affected.

What it is: CVE-2024-43813 is a medium-severity missing authorization vulnerability in Mattermost Mattermost, published on 22 Aug 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-43813 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-2024-43813/ (Markdown: https://insights.sbomify.com/CVE-2024-43813/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-43813
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-43813
- OSV: https://osv.dev/vulnerability/CVE-2024-43813

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-43813/
Summaries are generated and may contain mistakes; the official description above is the record.