CVE-2026-28432CWE-347

HTTP signature verification can be bypassed

High · published March 9, 2026

CVSS v4.0
7.1
EPSS
0%
Percentile
15.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
7.1 · HIGH
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
EPSS
0.00250 · 15.5th percentile
Weakness
CWE-347 · Improper Verification of Cryptographic Signature
Published
2026-03-09T21:19Z
EPSS history
Timeline
  • 09 MAR 21:19Z
    HTTP signature verification can be bypassed
    cvelistv5