Auth bypass in Logto

CVE-2026-15611

Logto allows unverified email-based SSO account linking, enabling an attacker to register an identity at a permissive IdP using a victim’s email and gain unauthorized access to the victim’s account.

Vulnerability class: Broken Authentication

EPSS: 0.004 (33.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

  • Logto — versions 1.11.0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-15611?
CVE-2026-15611 is a critical-severity vulnerability in Logto, classified under Improper Authentication. CVSS score: 9.1/10. Published 2026-07-23.
How severe is CVE-2026-15611?
Critical severity. CVSS v3 base score is 9.1 out of 10.