CVE-2026-47746
Severity CVSS v4.0:
HIGH
Type:
Unavailable / Other
Publication date:
03/08/2026
Last modified:
04/08/2026
Description
Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4, are vulnerable to timing attacks during JSON-LD signature validation and the compaction process. Because the JSON-LD parsing context is not shared between signature verification and subsequent processing, the application may trust information that should not be trusted, resulting in a time-of-check to time-of-use (TOCTOU) flaw. This allows an attacker to have fraudulent activities accepted as valid, leading to a loss of integrity. This issue has been fixed in version 2026.5.4.
Impact
Base Score 4.0
8.90
Severity 4.0
HIGH