High severity · published Jul 10, 2026
CVE-2026-57574
Misskey: TOTP tokens can be reused
7.4
CVSS
0.6%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MI
misskey · misskey-dev
< 2026.6.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-57574
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-57574
github.com
https://github.com/misskey-dev/misskey/commit/00c6210a591db2b0be438740d05b82070fa68ac6
github.com
https://github.com/misskey-dev/misskey/commit/d323fe00d04ac46ab0b4e66fce9169effaa8dfb7
github.com
https://github.com/misskey-dev/misskey/releases/tag/2026.6.0
github.com
https://github.com/misskey-dev/misskey/security/advisories/GHSA-2m5x-5mp6-6vpq
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