Authentication Bypass by Capture-replay in Misskey - CVE-2026-57574
Published: July 3, 2026
Vulnerability identifier: #VU136830
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-57574
CWE-ID: CWE-294
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Misskey Development Division
Affected software:
Misskey
Misskey
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to an error in Time-based One-Time Password (TOTP) authentication. A remote attacker can reuse the code to perform unauthorized actions.
How to mitigate CVE-2026-57574
Install updates from vendor's website.