Improper Verification of Cryptographic Signature in Misskey - CVE-2026-46713

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Main Vulnerability Database Vulnerabilities #VU132177

Improper Verification of Cryptographic Signature in Misskey - CVE-2026-46713

Published: May 23, 2026


Vulnerability identifier: #VU132177
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-46713
CWE-ID: CWE-347
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Misskey Development Division
Affected software:
Misskey

Detailed vulnerability description

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.


How to mitigate CVE-2026-46713

Install security update from vendor's website.

Sources