CVE-2026-57574 Misskey: TOTP tokens can be reused
Attackers can reuse TOTP codes to bypass two-factor authentication and take over user accounts in Misskey.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-57574?
CVE-2026-57574 is a high-severity authentication bypass vulnerability in misskey-dev misskey, published on 10 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-294
Which versions are affected by CVE-2026-57574?
How do I fix CVE-2026-57574?
No fix has been published for CVE-2026-57574 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-57574 being exploited?
There is no known exploitation of CVE-2026-57574 in the wild and no public exploit code.
Sources
Also known as GHSA-2m5x-5mp6-6vpq.