CVE-2025-66402

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 4.0

7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 24% of CVEs (scores of 2026-10-25)

CWE

CWE-862

Published

2025-12-16

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• misskey:misskey

Packages (OSV)

References

• https://github.com/misskey-dev/misskey/commit/dc77d59f8712d3fe0b73cd4af2035133839cd57b
• https://github.com/misskey-dev/misskey/security/advisories/GHSA-496g-mmpw-j9x3
• https://github.com/misskey-dev/misskey/security/advisories/GHSA-496g-mmpw-j9x3

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