CVE-2026-28432

HTTP signature verification can be bypassed

State: Published
Severity: 7.1 High
Published: Mar 9, 2026
Updated: Mar 10, 2026
Reserved: Feb 27, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	7.1 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-347 Improper Verification of Cryptographic Signature

Affected Products

Product	Versions
misskeymisskey-dev	< 2026.3.1Affected

References

https://github.com/misskey-dev/misskey/security/advisories/GHSA-grwc-c762-gcvp

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