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CVE-2026-47746 is a time-of-check to time-of-use vulnerability in Misskey, an open-source federated social media platform. Affected versions are 12.37.0 and later before 2026.5.4. The flaw occurs during JSON-LD signature validation and the subsequent compaction process because the JSON-LD parsing context used for signature verification is not shared with later processing. This inconsistency allows the application to validate one interpretation of signed data and then process a different interpretation, causing it to trust information that should not be trusted. As a result, fraudulent activities can be accepted as valid.
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No public exploit code observed for this vulnerability.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.