CVE-2025-66402

HIGH EPSS 17.8%
Published Dec 16, 20256mo ago · Modified Jun 17, 20262w ago
7.1 CVSS 4.0
High
Find Similar
Published Dec 16, 2025 6mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
7.1
Exploitability
—
Impact
—
Vector string
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
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
17.8% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-862 Missing Authorization Authorization

Affected Products 37

VendorProductVersionRange
misskeymisskey*≥13.1.0  –  <2025.12.0
misskeymisskey13.0.0any
misskeymisskey13.0.0any
misskeymisskey13.0.0any
misskeymisskey13.0.0any
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misskeymisskey13.0.0any
misskeymisskey13.0.0any
misskeymisskey13.0.0any

References 2

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

Remediation

  • github.com https://github.com/misskey-dev/misskey/commit/dc77d59f8712d3fe0b73cd4af2035133839cd57b
    Patch