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

9.3 CVSS

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.

Classification

CVE ID: CVE-2025-25306

CVSS Base Severity: CRITICAL

CVSS Base Score: 9.3

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N

Problem Types

CWE-346: Origin Validation Error CWE-441: Unintended Proxy or Intermediary ('Confused Deputy') CWE-1025: Comparison Using Wrong Factors

Affected Products

Vendor: misskey-dev

Product: misskey

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.02% (probability of being exploited)

EPSS Percentile: 2.71% (scored less or equal to compared to others)

EPSS Date: 2025-04-08 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-25306
https://github.com/misskey-dev/misskey/security/advisories/GHSA-6w2c-vf6f-xf26
https://github.com/misskey-dev/misskey/releases/tag/2025.2.1

Timeline