High 7.1Published Dec 15, 2025

CVE-2025-66402misskey.js's export data contains private post data

Updated under an hour ago (Oct 27, 2026, 3:30 AM ET)

Does this affect you?

It affects misskey-dev misskey and 1 other product. 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. Starting in version 13.0.0-beta.16 and prior to version 2025.12.0, an actor who does not have permission to view favorites or clips can can export the posts and view the contents. Version 2025.12.0 fixes the issue.

CVSS: 7.1 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness (CWE): CWE-862
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: Analyzed
Record last updated: Dec 16, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

misskey-dev misskey misskey_dev:misskey (from the name)	from 13.0.0-beta.16, < 2025.12.0	CNA record
misskey misskey misskey:misskey	from 13.1.0 before 2025.12.0; 13.0.0; 13.0.0; 13.0.0; 13.0.0; 13.0.0; 13.0.0; 13.0.0; and 29 more ranges	NVD

References

References

https://github.com/misskey-dev/misskey/security/advisories/GHSA-496g-mmpw-j9x3	x-refsource-confirm, exploit, vendor-advisory
https://github.com/misskey-dev/misskey/commit/dc77d59f8712d3fe0b73cd4af2035133839cd57b	x-refsource-misc, patch

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.