Federated note forgery via mismatched ActivityPub authority
Published Mar 10, 2025 · Updated Mar 12, 2025
Origin validation errors in Misskey 2025.2.0 and earlier allow remote attackers to forge federated notes through ActivityPub objects. Misskey accepts claimed authority from an object's url field without requiring matching authority in its id field for object types that bind authority to id. No authentication or user interaction is required; a malicious federated object can be accepted with false authorship, altering note integrity.
Summary
What happened
Origin validation errors in Misskey 2025.2.0 and earlier allow remote attackers to forge federated notes through ActivityPub objects. Misskey accepts claimed authority from an object's url field without requiring matching authority in its id field for object types that bind authority to id. No authentication or user interaction is required; a malicious federated object can be accepted with false authorship, altering note integrity.
The record
- CVE
- CVE-2025-25306
- Published
- Mar 10, 2025
- Updated
- Mar 12, 2025
- Vendor
- Misskey Project
- Product
- Misskey
- Classifications
- CWE-346, CWE-1025, CWE-441, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 10, 2025CVE publishedPublication date reported by the CVE source.
- Mar 12, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=< 2025.2.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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