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CVE-2026-15611— Unverified email-based SSO account linking

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 1.37.1及之前版本存在授权问题漏洞，该漏洞源于允许未经验证的基于电子邮件的SSO帐户链接，可能使攻击者使用受害者电子邮件注册身份，从而获得对受害者账户的未授权访问。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.48% · P40

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
Logto Logto 1.11.0≤ 1.37.1 affected
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I. Basic Information for CVE-2026-15611

Vulnerability Information
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Vulnerability Title
Unverified email-based SSO account linking
Source: CVE Program / CVE List V5
Vulnerability Description
Logto allows unverified email-based SSO account linking, enabling an attacker to register an identity at a permissive IdP using a victim’s email and gain unauthorized access to the victim’s account.
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 授权问题漏洞
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 1.37.1及之前版本存在授权问题漏洞，该漏洞源于允许未经验证的基于电子邮件的SSO帐户链接，可能使攻击者使用受害者电子邮件注册身份，从而获得对受害者账户的未授权访问。
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 1.11.0 ~ 1.37.1 -

II. Public POCs for CVE-2026-15611

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III. Intelligence Information for CVE-2026-15611

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Patches & Fixes for CVE-2026-15611 (1)

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

CVE-2026-15612 LOIDC nonce validation bypass
CVE-2026-15617 Principal/domain lookup without case normalization
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-2026-15611

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