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    CVE-2026-28432

    Misskey is an open source, federated social media platform. All Misskey servers prior to 2026.3.1 contain a vulnerability that allows bypassing HTTP signature verification. Although this is a vulnerability related to federation, it affects all servers regardless of whether federation is enabled or disabled. This vulnerability is fixed in 2026.3.1.

    Published:Mar 9, 2026
    Last Modified:Apr 16, 2026
    EPS:Mar 9, 2026
    EPSS Score:0.00018
    CVSS Score:7.5

    Affected Products

    Vendor
    Misskey
    Product
    Misskey

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

    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-2026-28431 (CVSS 9.2) — Misskey is an open source, federated social media platform. All Misskey servers running versions 8.45.0 and la…
    CVE-2025-66482 (CVSS 6.9) — Misskey is an open source, federated social media platform. Attackers who use an untrusted reverse proxy or no…

    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