Is CVE-2026-28432 actively exploited?

CVE-2026-28432 has no public evidence of in-the-wild exploitation as of 2026-03-13.

What is the CVSS score for CVE-2026-28432?

CVE-2026-28432 has a CVSS score of 7.1 (HIGH severity). Vector: 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/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.

How do I patch CVE-2026-28432?

Patch guidance is available from misskey security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-28432.

Fix CVE-2026-28432 - HIGH misskey misskey

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.

CVSS Metrics

Vector: 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/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
Complexity: low
Privileges: none
User Action: passive
Confidentiality: undefined
Integrity: undefined
Availability: undefined
Weaknesses: CWE-347

Metadata

Primary Vendor: MISSKEY
Published: 3/10/2026
Last Modified: 3/13/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-28432

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary