# CVE-2024-32983: Misskey allows the impersonation and takeover of remote accounts with unnormalized signed activities

> Attackers can impersonate users and take over remote accounts by exploiting improper normalization of signed ActivityPub activities in Misskey.

- **Severity:** High 8.2 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Jun 2024
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-2vxv-pv3m-3wvj

## What is CVE-2024-32983?

CVE-2024-32983 is a high-severity authentication bypass vulnerability in misskey-dev misskey, published on 3 Jun 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Misskey is an open source, decentralized microblogging platform. Misskey doesn't perform proper normalization on the JSON structures of incoming signed ActivityPub activity objects before processing them, allowing threat actors to spoof the contents of signed activities and impersonate the authors of the original activities. This vulnerability is fixed in 2024.5.0.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2024-32983?

It affects 1 product.


Products: Misskey Misskey.

## How do I fix CVE-2024-32983?

No fix has been published for CVE-2024-32983 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-32983 being exploited?

There is no known exploitation of CVE-2024-32983 in the wild and no public exploit code.

## Other vulnerabilities in misskey-dev misskey

- [CVE-2025-25306](https://insights.sbomify.com/CVE-2025-25306/): Misskey's Incomplete Patch of CVE-2024-52591 Leads to Forgery of Federated Notes (critical 9.3)
- [CVE-2023-49079](https://insights.sbomify.com/CVE-2023-49079/): Misskey's missing signature validation allows arbitrary users to impersonate any remote user. (critical 9.3)
- [CVE-2026-28431](https://insights.sbomify.com/CVE-2026-28431/): Misskey lacks proper authorization checks and input validation (critical 9.2)
- [CVE-2023-52139](https://insights.sbomify.com/CVE-2023-52139/): Misskey vulnerable to improper authorization when accessing with third-party application (critical 9.1)
- [CVE-2024-52590](https://insights.sbomify.com/CVE-2024-52590/): Missing validation allows spoofed profiles in Misskey (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-32983 and fix it if it is affected.

What it is: CVE-2024-32983 is a high-severity authentication bypass vulnerability in misskey-dev misskey, published on 3 Jun 2024. 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-2024-32983 in the wild and no public exploit code.

Affected product: misskey-dev misskey. 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-2024-32983/ (Markdown: https://insights.sbomify.com/CVE-2024-32983/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-32983
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-32983
- OSV: https://osv.dev/vulnerability/CVE-2024-32983

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-32983/
Summaries are generated and may contain mistakes; the official description above is the record.