CVE-2026-15617

CRITICAL

Logto - Principal/domain Lookup Without Case Normalization

Title source: rule

Description

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

References (1)

Core 1

Core References

https://github.com/logto-io/logto/blob/ea3ede35028dfd0bbb6d7b239623ce0e7f6cdff8/packages/core/src/libraries/verification-helpers/single-sign-on-guard.ts#L23-L33

View Writeup ZIP pw:eip

Scores

CVSS v3 9.1

EPSS 0.0028

EPSS Percentile 20.1%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-178

Status published

Products (1)

Logto/Logto 1.10.1 - 1.37.1

Published Jul 23, 2026

Tracked Since Jul 23, 2026