by Kastro
Paper/Archive/CVE-2026-46713

CVE-2026-46713

misskey-dev misskey — Misskey: JSON-LD signature validation + compaction may lead to improper activity handling

EPSS 0.3%CVSS 9.2
critical.is priorityof 100
32
CVSS 9.2 (CNA)9.2 / 10 × 3027.6Not in CISA KEV+300.0EPSS percentile 20.5.205 × 204.1No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4, contain a vulnerability in the JSON-LD signature validation and compaction process that allows spoofed activities to be accepted as valid. This issue has been fixed in version 2026.5.4.

Affected

ProductAffectedFixed inSource
misskey>= 12.37.0, < 2026.5.4–CNA

Scores by source

GitHub_M (CNA)9.2CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:H/SA:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

refgithub.com/misskey-dev/misskey/security/advisories/GHSA-w8x2-gpq6-jxvfrefgithub.com/misskey-dev/misskey/releases/tag/2026.5.4