CVE-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.

CVSS v3.1 Score

9.3

CRITICAL

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

Weakness Type (CWE)

CWE-346 CWE-346

CWE-441 CWE-441

CWE-1025 CWE-1025

Affected Products

Vendor	Product	Versions
misskey	misskey	< 2025.2.1

References

Advisories & Patches

https://github.com/misskey-dev/misskey/releases/tag/2025.2.1

Other References

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

Frequently Asked Questions

What is CVE-2025-25306? +

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. It has a CVSS v3.1 base score of 9.3 (CRITICAL).

How severe is CVE-2025-25306? +

CVE-2025-25306 has a CVSS v3.1 score of 9.3 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-25306? +

CVE-2025-25306 affects products from misskey, specifically: misskey. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-25306? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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