# CVE-2025-25306: Misskey's Incomplete Patch of CVE-2024-52591 Leads to Forgery of Federated Notes

> Attackers can forge federated notes by exploiting insufficient validation of ActivityPub object fields, allowing unauthorized content attribution.

- **Severity:** Critical 9.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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:** 10 Mar 2025
- **Updated:** 12 Mar 2025
- **Also known as:** GHSA-6w2c-vf6f-xf26

## What is CVE-2025-25306?

CVE-2025-25306 is a critical vulnerability in misskey-dev misskey, published on 10 Mar 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Misskey is an open source, federated social media platform. The patch for CVE-2024-52591 did not sufficiently validate the relation between the `id` and `url` fields of ActivityPub objects. An attacker can forge an object where they claim authority in the `url` field even if the specific ActivityPub object type require authority in the `id` field. Version 2025.2.1 addresses the issue.

Weakness: CWE-441 (Unintended Proxy or Intermediary), CWE-346 (Origin Validation Error), CWE-1025 (Comparison Using Wrong Factors)

## Which versions are affected by CVE-2025-25306?

It affects 1 product.


Products: Misskey Misskey.

## How do I fix CVE-2025-25306?

No fix has been published for CVE-2025-25306 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-25306 being exploited?

There is no known exploitation of CVE-2025-25306 in the wild and no public exploit code.

## Other vulnerabilities in misskey-dev misskey

- [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)
- [CVE-2024-52591](https://insights.sbomify.com/CVE-2024-52591/): Missing validation allows spoofed profiles and notes in Misskey (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-25306 and fix it if it is affected.

What it is: CVE-2025-25306 is a critical vulnerability in misskey-dev misskey, published on 10 Mar 2025. 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-2025-25306 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-2025-25306/ (Markdown: https://insights.sbomify.com/CVE-2025-25306/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-25306
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-25306
- OSV: https://osv.dev/vulnerability/CVE-2025-25306

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-25306/
Summaries are generated and may contain mistakes; the official description above is the record.