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CVE-2026-57574— Misskey: TOTP tokens can be reused

Quick assessment

Affected
misskey-dev misskey
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

misskey-dev misskey是misskey-dev公司的一款自托管的社交网络平台软件。 misskey-dev misskey 2026.6.0之前版本存在授权问题漏洞，该漏洞源于UserAuthService中基于时间的一次性密码身份验证对已使用令牌的验证不足，允许在有效时间步长内重复使用单次使用代码，如果同时获取凭据和一次性密码代码，攻击者可能重用该代码执行未授权操作，可能导致账户接管。

AI Predicted 8.1 Difficulty: Easy EPSS 0.55% · P44

Possible ATT&CK Techniques 1 AI

T1110.003 · Password Spraying

Affected Version Matrix 1

VendorProduct Version RangeStatus
misskey-dev misskey < 2026.6.0 affected
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I. Basic Information for CVE-2026-57574

Vulnerability Information
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Vulnerability Title
Misskey: TOTP tokens can be reused
Source: CVE Program / CVE List V5
Vulnerability Description
Misskey is an open source, federated social media platform. Prior to 2026.6.0, Misskey contains a vulnerability in Time-based One-Time Password (TOTP) authentication in UserAuthService where insufficient validation of used tokens allows the reuse of a single-use code within its valid time step. If both credentials and a TOTP code are obtained concurrently, an attacker may reuse the code to perform unauthorized actions, potentially leading to account takeover. This issue is fixed in version 2026.6.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用捕获-重放进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
misskey-dev misskey 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
misskey-dev misskey是misskey-dev公司的一款自托管的社交网络平台软件。 misskey-dev misskey 2026.6.0之前版本存在授权问题漏洞，该漏洞源于UserAuthService中基于时间的一次性密码身份验证对已使用令牌的验证不足，允许在有效时间步长内重复使用单次使用代码，如果同时获取凭据和一次性密码代码，攻击者可能重用该代码执行未授权操作，可能导致账户接管。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
misskey-dev misskey < 2026.6.0 -

II. Public POCs for CVE-2026-57574

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III. Intelligence Information for CVE-2026-57574

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Patches & Fixes for CVE-2026-57574 (2)

Vendor Advisories for CVE-2026-57574 (1)

Vendor Pages for CVE-2026-57574 (1)

IV. Related Vulnerabilities

Same product: misskey
Same vendor: misskey-dev
Same weakness: CWE-294

V. Comments for CVE-2026-57574

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