Improper Verification of Cryptographic Signature in Misskey - CVE-2026-46713
Published: May 23, 2026
Vulnerability identifier: #VU132177
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-46713
CWE-ID: CWE-347
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to spoof activities.
The vulnerability exists due to improper verification of cryptographic signature in the JSON-LD signature validation and compaction process when processing ActivityPub activities. A remote attacker can send a spoofed activity to spoof activities.
Affected software
Misskey
How to mitigate CVE-2026-46713
Install security update from vendor's website.
Misskey - update to 2026.5.4