# CVE-2026-74869: stoatchat before 0.15.0 Missing Authorization via Subscribe

> Authenticated attackers can enumerate members and monitor profile updates of private servers without membership by exploiting missing authorization in the Subscribe handler.

- **Severity:** High 8.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA: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:** 17 Aug 2026
- **Updated:** 17 Aug 2026
- **Also known as:** GHSA-5cwg-5wjq-gqw2, GHSA-jj3j-9qr7-jgfc

## What is CVE-2026-74869?

CVE-2026-74869 is a high-severity missing authorization vulnerability in stoatchat, published on 17 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

stoatchat before 0.15.0 contains a missing authorization vulnerability in the Subscribe message handler that allows authenticated attackers to enumerate members and monitor profile updates of private servers without membership. Attackers can subscribe to any server's member-update topic by sending a Subscribe message with an arbitrary server ID, receiving live UserUpdate events including display names, avatars, and status changes for members they should not have access to.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-74869?


## How do I fix CVE-2026-74869?

No fix has been published for CVE-2026-74869 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-74869 being exploited?

There is no known exploitation of CVE-2026-74869 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-74869 and fix it if it is affected.

What it is: CVE-2026-74869 is a high-severity missing authorization vulnerability in stoatchat, published on 17 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-74869 in the wild and no public exploit code.

Affected product: stoatchat. 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-2026-74869/ (Markdown: https://insights.sbomify.com/CVE-2026-74869/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-74869
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-74869
- OSV: https://osv.dev/vulnerability/CVE-2026-74869

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-74869/
Summaries are generated and may contain mistakes; the official description above is the record.