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.

Published · last modified .

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.

EPSS exploit prediction

EPSS: 0.004 (35.9th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-15617: held from 0.004 to 0.004.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

  • Logto — versions 1.10.1

Weakness classification (CWE)

References

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.