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    CVE-2026-15611

    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.

    Published:Jul 23, 2026
    Last Modified:Aug 2, 2026
    EPS:Jul 23, 2026
    EPSS Score:0.00274
    CVSS Score:9.1

    Affected Products

    Vendor
    Logto-io
    Product
    Logto

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-287 Improper Authentication

    Related CVEs

    CVE-2026-82263 (CVSS 8.2) — Logto through 1.42.0 contains a server-side request forgery vulnerability in the OIDC SSO connector creation e…
    CVE-2026-82262 (CVSS 8.2) — Logto through 1.42.0 contains a server-side request forgery vulnerability in the POST /api/hooks/:id/test endp…
    CVE-2026-63187 (CVSS 6.3) — Logto is the modern, open-source auth infrastructure for SaaS and AI apps. From 1.40.1 until 1.41.0, Logto's .…
    CVE-2026-63188 (CVSS 8.7) — Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 0.3.9, the Logto Tunnel np…
    CVE-2026-62317 (CVSS 7.5) — Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Logto's email suba…
    CVE-2026-15612 (CVSS 9.1) — Logto bypasses OIDC nonce validation when the nonce claim is absent from the id_token, enabling replay of auth…
    CVE-2026-15614 (CVSS 7.5) — Logto silently fails to delete IdP-initiated SAML sessions, enabling session replay and reuse within the sessi…
    CVE-2026-15615 (CVSS 7.5) — Logto omits validation of the SAML <Conditions> element, enabling attackers to strip time and audience restric…
    CVE-2026-15616 (CVSS 9.1) — Logto does not enforce locally configured MFA during SSO authentication, allowing users to bypass second-facto…
    CVE-2026-15617 (CVSS 9.1) — Logto performs principal lookup without normalizing email and identifier strings, enabling principal collision…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High