What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-03-10 · updated 2026-06-17
• Weakness: CWE-346

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.

Affected products

• misskey-dev misskey: before 2025.2.1 — fixed in 2025.2.1

How to fix

Upgrade to a fixed version: misskey-dev misskey 2025.2.1. Check the vendor advisory for mitigations.

References

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

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