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    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.

    Published:Dec 15, 2025
    Last Modified:Jan 6, 2026
    EPS:Dec 15, 2025
    EPSS Score:0.00043
    CVSS Score:6.5

    Affected Products

    Vendor
    Misskey
    Product
    Misskey

    Exploits

    https://github.com/misskey-dev/misskey/security/advisories/GHSA-496g-mmpw-j9x3https://github.com/misskey-dev/misskey/security/advisories/GHSA-496g-mmpw-j9x3

    Common Weakness Enumeration

    CWE-862 Missing Authorization

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-665 Exploitation of Thunderbolt Protection Flaws

    Related CVEs

    CVE-2026-46714 (CVSS 5.1) — Misskey is an open source, federated social media platform. IVersions 8.63.0 and later, but prior to 2026.5.4,…
    CVE-2026-47746 (CVSS 8.9) — Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4,…
    CVE-2026-46713 (CVSS 9.2) — Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4,…
    CVE-2026-46712 (CVSS 2.3) — Misskey is an open source, federated social media platform. Versions 2025.3.2 and later, but prior to 2026.5.4…
    CVE-2026-48115 (CVSS 6.3) — Misskey is an open source, federated social media platform. All Misskey servers running versions 2024.5.0 and …
    CVE-2026-57574 (CVSS 7.4) — Misskey is an open source, federated social media platform. Prior to 2026.6.0, Misskey contains a vulnerabilit…
    CVE-2026-57575 (CVSS 6.9) — Misskey is an open source, federated social media platform. Prior to 2026.6.0, Misskey contains a Server-Side …
    CVE-2026-28433 (CVSS 2.3) — Misskey is an open source, federated social media platform. All Misskey servers running versions 10.93.0 and l…
    CVE-2026-28432 (CVSS 7.1) — Misskey is an open source, federated social media platform. All Misskey servers prior to 2026.3.1 contain a vu…
    CVE-2026-28431 (CVSS 9.2) — Misskey is an open source, federated social media platform. All Misskey servers running versions 8.45.0 and la…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High