CVE-2026-57574Network attack vector

Account takeover via reusable TOTP codes

Published Jul 10, 2026 · Updated Jul 10, 2026

Authentication bypass in Misskey before 2026.6.0 allows remote attackers to reuse a captured TOTP code for account access. UserAuthService validates a previously accepted code again during the same TOTP time step instead of rejecting the second use. Exploitation requires simultaneous possession of the victim's credentials and valid code, and permits unauthorized actions under that account.

CVSS severity7.4
High
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Misskey before 2026.6.0 allows remote attackers to reuse a captured TOTP code for account access. UserAuthService validates a previously accepted code again during the same TOTP time step instead of rejecting the second use. Exploitation requires simultaneous possession of the victim's credentials and valid code, and permits unauthorized actions under that account.

The record

CVE
CVE-2026-57574
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
Misskey Project
Product
Misskey
Classifications
CWE-294, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2026.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Misskey Project · Misskeyversion=< 2026.6.0

Published CVSS scores

7.4GitHubCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-294Authentication Bypass by Capture-replay
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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