What is CVE-2026-28432?

CVE-2026-28432 is a high-severity vulnerability in Misskey, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-03-10.

How severe is CVE-2026-28432?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Misskey

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…

EPSS: 0.001 (4.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Misskey
Misskey-dev Misskey — versions < 2026.3.1

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-28432?: CVE-2026-28432 is a high-severity vulnerability in Misskey, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-03-10.
How severe is CVE-2026-28432?: High severity. CVSS v3 base score is 7.5 out of 10.