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    CVE-2026-53515

    Better Auth is an authentication and authorization library for TypeScript. From 1.2.10 until 1.6.11, the @better-auth/sso plugin's POST /sso/register endpoint lets any organization member attach a new SSO provider to that organization because registerSSOProvider checks only for a membership row and does not require an owner or admin role, allowing attacker-controlled OIDC or SAML providers to drive /sso/callback/{providerId} organization provisioning. This issue is fixed in version 1.6.11.

    Published:Jul 15, 2026
    Last Modified:Jul 23, 2026
    EPS:Jul 15, 2026
    EPSS Score:0.00238
    CVSS Score:7.1

    Affected Products

    Vendor
    Better-auth
    Product
    Better Auth

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs
    CAPEC-104 Cross Zone Scripting
    CAPEC-122 Privilege Abuse
    CAPEC-127 Directory Indexing
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-17 Using Malicious Files
    CAPEC-233 Privilege Escalation
    CAPEC-39 Manipulating Opaque Client-based Data Tokens
    CAPEC-402 Bypassing ATA Password Security
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-5 Blue Boxing
    CAPEC-51 Poison Web Service Registry
    CAPEC-58 Restful Privilege Elevation
    CAPEC-59 Session Credential Falsification through Prediction
    CAPEC-60 Reusing Session IDs (aka Session Replay)
    CAPEC-647 Collect Data from Registries
    CAPEC-668 Key Negotiation of Bluetooth Attack (KNOB)
    CAPEC-76 Manipulating Web Input to File System Calls
    CAPEC-77 Manipulating User-Controlled Variables
    CAPEC-87 Forceful Browsing

    Related CVEs

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    CVE-2026-67333 (CVSS 5.1) — better-auth before 1.6.13 (and pre-release builds 1.7.0-beta.0 through 1.7.0-beta.3) fail to validate the sche…
    CVE-2026-67329 (CVSS 7.1) — @better-auth/stripe versions >= 1.4.11 and < 1.6.21, and >= 1.7.0-beta.0 and < 1.7.0-beta.10, contain an autho…
    CVE-2026-67334 (CVSS 5.1) — better-auth versions before 1.6.11 fail to delete cached sessions when removing users via admin, anonymous, or…
    CVE-2025-71403 (CVSS 7.1) — better-auth versions before 1.1.20 contain a bypass vulnerability in trustedOrigins validation logic affecting…
    CVE-2026-67337 (CVSS 7.1) — better-auth versions before 1.4.9 contain a two-factor authentication bypass vulnerability when session.cookie…
    CVE-2025-71404 (CVSS 5.1) — better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting (XSS) vulnerabili…
    CVE-2026-67327 (CVSS 8.7) — better-auth versions >= 1.1.3 and < 1.6.22 (and pre-release versions >= 1.7.0-beta.0 and < 1.7.0-beta.10) are …
    CVE-2026-67331 (CVSS 8.7) — better-auth SCIM versions from 1.5.0 before 1.7.0-beta.4 fail to bind non-organization SCIM providers to their…

    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