Origin validation error in Misskey



Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2025-25306
CWE-ID CWE-346
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Misskey
Web applications / Modules and components for CMS

Vendor Misskey Development Division

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Origin validation error

EUVDB-ID: #VU106268

Risk: High

CVSSv4.0: 6.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2025-25306

CWE-ID: CWE-346 - Origin Validation Error

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to incomplete patch on CVE-2024-52591 (SB2025033119). A remote 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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Misskey: 2025.1.0 - 2025.2.0

CPE2.3 External links

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


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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