CVE-2026-55377: Logto-Io Logto

High severity, CVSS 8.1. EPSS: 0.5% chance of exploitation in the next 30 days.

Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Logto's Account Center step-up check accepted any active verification record that belonged to the current user and had isVerified === true. A WebAuthn registration verification record for binding a new passkey could be created and verified with only an existing Account API bearer token, then sent in the logto-verification-id header and treated as identityVerified=true by Account Center routes, allowing MFA factor management without proving possession of an existing password, identifier, or MFA factor. This issue is fixed in version 1.41.0.

Affected products

• Logto-Io Logto: before 1.41.0 (fixed in 1.41.0)

Published 2026-07-10. Last modified 2026-07-13.