Critical 9.2Published Aug 3, 2026

CVE-2026-46713Misskey: JSON-LD signature validation + compaction may lead to improper activity handling

Updated under an hour ago (Oct 27, 2026, 11:40 AM ET)

Does this affect you?

It affects misskey-dev misskey. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for misskey-dev misskey

Exploited in the last 30 days

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.

CVSS: 9.2 CRITICAL (v4.0, CNA)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
Weakness (CWE): CWE-347
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Aug 4, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

misskey-dev misskey misskey_dev:misskey (from the name)	from 12.37.0, < 2026.5.4	CNA record

References

References

https://github.com/misskey-dev/misskey/security/advisories/GHSA-w8x2-gpq6-jxvf	x-refsource-confirm
https://github.com/misskey-dev/misskey/releases/tag/2026.5.4	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.