CVE-2025-66402

Name: CVE-2025-66402
Creator: NVD / NIST
Published: 2025-12-16T00:16:02.207+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.1/10EPSS 0.26%

Last modified Jun 17, 2026

CVE-2025-66402 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. 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. EPSS estimates a 0.26% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

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

CVSS 4.0

7.1/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.26%

17.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-862

Affected Software

Vendor	Product	Versions
Misskey	Misskey	>= 13.1.0, < 2025.12.0
Misskey	Misskey	13.0.0

References

https://github.com/misskey-dev/misskey/commit/dc77d59f8712d3fe0b73cd4af2035133839cd57bPatch
https://github.com/misskey-dev/misskey/security/advisories/GHSA-496g-mmpw-j9x3Exploit, Vendor Advisory
https://github.com/misskey-dev/misskey/security/advisories/GHSA-496g-mmpw-j9x3Exploit, Vendor Advisory

Timeline

Published: Dec 16, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-66402?

How severe is CVE-2025-66402?

CVE-2025-66402 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 0.26% probability of exploitation in the next 30 days.

How do I fix CVE-2025-66402?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-66402?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST