CVE-2026-57574: CWE-294: Authentication Bypass by Capture-replay in misskey-dev misskey
Misskey, an open source federated social media platform, has a vulnerability in its Time-based One-Time Password (TOTP) authentication prior to version 2026.6.0. The issue allows reuse of a single-use TOTP code within its valid time step due to insufficient validation, enabling an attacker with concurrent access to credentials and a TOTP code to perform unauthorized actions, potentially leading to account takeover. This vulnerability is fixed in version 2026.6.0.
AI Analysis
Technical Summary
CVE-2026-57574 describes an authentication bypass vulnerability in Misskey's UserAuthService TOTP implementation before version 2026.6.0. The flaw arises because the system does not properly invalidate a TOTP code after use within its valid time window, allowing replay of the same code. An attacker who obtains both user credentials and a valid TOTP code simultaneously can reuse the code to bypass authentication controls and perform unauthorized actions. The vulnerability is classified under CWE-294 (Authentication Bypass). The issue is resolved in Misskey version 2026.6.0.
Potential Impact
An attacker who gains access to both user credentials and a valid TOTP code can reuse the code within its valid time step to bypass authentication, potentially leading to unauthorized account access and takeover. This compromises the integrity of the authentication mechanism and user account security.
Mitigation Recommendations
Upgrade Misskey to version 2026.6.0 or later, where this vulnerability is fixed. No other mitigation is indicated or required according to the available data.
CVE-2026-57574: CWE-294: Authentication Bypass by Capture-replay in misskey-dev misskey
Description
Misskey, an open source federated social media platform, has a vulnerability in its Time-based One-Time Password (TOTP) authentication prior to version 2026.6.0. The issue allows reuse of a single-use TOTP code within its valid time step due to insufficient validation, enabling an attacker with concurrent access to credentials and a TOTP code to perform unauthorized actions, potentially leading to account takeover. This vulnerability is fixed in version 2026.6.0.
CVSS v4.0
Score 7.4high
Affected software
pkg:github/misskey-dev/misskeyRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-57574 describes an authentication bypass vulnerability in Misskey's UserAuthService TOTP implementation before version 2026.6.0. The flaw arises because the system does not properly invalidate a TOTP code after use within its valid time window, allowing replay of the same code. An attacker who obtains both user credentials and a valid TOTP code simultaneously can reuse the code to bypass authentication controls and perform unauthorized actions. The vulnerability is classified under CWE-294 (Authentication Bypass). The issue is resolved in Misskey version 2026.6.0.
Potential Impact
An attacker who gains access to both user credentials and a valid TOTP code can reuse the code within its valid time step to bypass authentication, potentially leading to unauthorized account access and takeover. This compromises the integrity of the authentication mechanism and user account security.
Mitigation Recommendations
Upgrade Misskey to version 2026.6.0 or later, where this vulnerability is fixed. No other mitigation is indicated or required according to the available data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-24T18:49:56.208Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a515e2368715ace43325a17
Added to database: 07/10/2026, 21:03:31 UTC
Last enriched: 07/10/2026, 21:17:30 UTC
Last updated: 07/10/2026, 21:17:31 UTC
Views: 4
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