CVE-2025-25306CRITICAL 9.3EPSS p6.2%

CVE-2025-25306CVE-2025-25306

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.

Scoring

CVSS 3.19.3 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N
EPSS0.17% probability of exploitation · percentile 6.2% · 2026-06-18T12:00:27Z
Published2025-03-10
Last modified2025-11-26

Underlying weaknesses· 3

CWE-346CWE-441CWE-1025

References

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

3

TypeTargetConfidenceTier
WeaknessComparison Using Wrong Factorscwe-10250%live
WeaknessOrigin Validation Errorcwe-3460%live
WeaknessUnintended Proxy or Intermediary ('Confused Deputy')cwe-4410%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.