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CVE-2026-15617— Principal/domain lookup without case normalization

Quick assessment

Affected
Logto Logto
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Logto Logto是Logto社区开源的一个面向 SaaS 和 AI 应用的现代化身份验证基础架构。 Logto 1.10.1版本及之前版本存在输入验证错误漏洞，该漏洞源于在查找principal时未规范化电子邮件和标识符字符串，可能导致经过大小写或Unicode差异的principal碰撞和未授权账户访问。

AI Predicted 9.8 Difficulty: Easy EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship

Affected Version Matrix 1

VendorProduct Version RangeStatus
Logto Logto 1.10.1≤ 1.37.1 affected
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I. Basic Information for CVE-2026-15617

Vulnerability Information
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Vulnerability Title
Principal/domain lookup without case normalization
Source: CVE Program / CVE List V5
Vulnerability Description
Logto performs principal lookup without normalizing email and identifier strings, enabling principal collision and unauthorized account access via case- or Unicode-different identities.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Logto 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Logto Logto是Logto社区开源的一个面向 SaaS 和 AI 应用的现代化身份验证基础架构。 Logto 1.10.1版本及之前版本存在输入验证错误漏洞，该漏洞源于在查找principal时未规范化电子邮件和标识符字符串，可能导致经过大小写或Unicode差异的principal碰撞和未授权账户访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Logto Logto 1.10.1 ~ 1.37.1 -

II. Public POCs for CVE-2026-15617

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III. Intelligence Information for CVE-2026-15617

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Patches & Fixes for CVE-2026-15617 (1)

Same Patch Batch · Logto · 2026-07-23 · 6 CVEs total

CVE-2026-15612 LOIDC nonce validation bypass
CVE-2026-15611 Unverified email-based SSO account linking
CVE-2026-15615 SAML <Conditions> element not validated
CVE-2026-15616 Local MFA not enforced during SSO sign-in
CVE-2026-15614 IdP-initiated SAML sessions not reliably invalidated (replay)

IV. Related Vulnerabilities

Same product: Logto
Same vendor: Logto

V. Comments for CVE-2026-15617

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