CVE-2026-46713

CRITICAL

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

Title source: cna
STIX 2.1

Description

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.

References (2)

Core 2
Core References

Scores

CVSS v4 9.2
EPSS 0.0017
EPSS Percentile 7.1%
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-347
Status published
Products (1)
misskey-dev/misskey >= 12.37.0, < 2026.5.4
Published Aug 03, 2026
Tracked Since Aug 04, 2026