CVE-2026-57574

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.

CVSS 4.0

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

EPSS

0.6% chance of exploitation in the next 30 days; higher than 45% of CVEs (scores of 2026-10-25)

CWE

CWE-294

Published

2026-07-10

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

References

• https://github.com/misskey-dev/misskey/commit/00c6210a591db2b0be438740d05b82070fa68ac6
• https://github.com/misskey-dev/misskey/commit/d323fe00d04ac46ab0b4e66fce9169effaa8dfb7
• https://github.com/misskey-dev/misskey/releases/tag/2026.6.0
• https://github.com/misskey-dev/misskey/security/advisories/GHSA-2m5x-5mp6-6vpq

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