CVE-2026-57574

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.

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Weakness Type (CWE)

CWE-294 CWE-294

References

Other 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

Frequently Asked Questions

What is 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.

How do I check if I'm vulnerable to CVE-2026-57574? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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