جزئیات آسیب‌پذیری

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.

• https://github.com/misskey-dev/misskey/security/advisories/GHSA-38jx-423m-g387 x_refsource_CONFIRM
• https://github.com/misskey-dev/misskey/releases/tag/2026.5.4 x_refsource_MISC