Vulnerability details

CVE-2025-66402

misskey-dev misskey

misskey.js's export data contains private post data

CVSS 4.0

7.1High

Official description

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 scores

Score	Version	Source	Vector
7.1High	4.0	CVEProject cvelistV5 (CNA) (GitHub_M)	`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`

Affected products

Vendor	Product	Versions	Source
misskey-dev	misskey	>= 13.0.0-beta.16, < 2025.12.0	CVEProject cvelistV5 (CNA)

References and advisories

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

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Details

Published: 2025-12-16
Last updated: 2025-12-16
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.31%

Probability of exploitation in 30 days

24.4%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: Proof of concept
Technical impact: Partial

Weaknesses (CWE)

CWE-862
Missing Authorization