What is CVE-2026-15617?

CVE-2026-15617 is a critical-severity vulnerability in Logto, classified under Improper Handling of Case Sensitivity. CVSS score: 9.1/10. Published 2026-07-23.

How severe is CVE-2026-15617?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Logto

CVE-2026-15617

Logto performs principal lookup without normalizing email and identifier strings, enabling principal collision and unauthorized account access via case- or Unicode-different identities.

EPSS: 0.004 (28.9th 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 1.10.1

Weakness classification (CWE)

CWE-178 — Improper Handling of Case Sensitivity

References

cret@cert.org

Frequently asked questions

What is CVE-2026-15617?: CVE-2026-15617 is a critical-severity vulnerability in Logto, classified under Improper Handling of Case Sensitivity. CVSS score: 9.1/10. Published 2026-07-23.
How severe is CVE-2026-15617?: Critical severity. CVSS v3 base score is 9.1 out of 10.