CVE-2026-47746
High · CVSS 8.9Published 2026-08-03
CVSS
8.9
High
EPSS
—
exploit probability
Active Exploit
No
not yet listed
What is CVE-2026-47746?
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.
CVSS Score Explained
CVSS 8.9 is High severity. Exploitation is likely straightforward and the impact is significant — data loss, privilege escalation, or remote code execution are common outcomes. Patch as soon as possible.
EPSS Exploitation Probability
No EPSS score yet — model needs more data on this CVE.
References & Patches
- PATCHhttps://github.com/misskey-dev/misskey/releases/tag/2026.5.4
- ›https://github.com/misskey-dev/misskey/security/advisories/GHSA-38jx-423m-g387
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