CVE-2026-15617

Principal/domain lookup without case normalization

State: Published
Severity: 9.1 Critical
Published: Jul 23, 2026
Updated: Jul 27, 2026
Reserved: Jul 13, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N	CISA-ADP

Weaknesses

CWE-178 Improper Handling of Case Sensitivity

Affected Products

Product	Versions
LogtoLogto	1.10.1 through 1.37.1Affected

References

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

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