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CVE-2026-53515— Better Auth: Privilege escalation via SSO provider registration: missing admin role check in @better-auth/sso

Quick assessment

Affected
better-auth better-auth
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

better-auth better-auth是better-auth的防病毒反病毒产品。 Better Auth 1.2.10版本至1.6.11之前版本存在安全漏洞，该漏洞源于SSO插件的POST /sso/register端点仅检查成员身份，未要求所有者或管理员角色，可能导致任意组织成员添加新的SSO提供商，从而允许攻击者控制的OIDC或SAML提供商进行组织配置。

CVSS 7.1 · High EPSS 0.43% · P35

Affected Version Matrix 2

VendorProduct Version RangeStatus
@better-auth sso >= 1.2.10, < 1.6.11 affected
better-auth better-auth >= 1.2.10, < 1.6.11 affected
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I. Basic Information for CVE-2026-53515

Vulnerability Information
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Vulnerability Title
Better Auth: Privilege escalation via SSO provider registration: missing admin role check in @better-auth/sso
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Better Auth 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
better-auth better-auth是better-auth的防病毒反病毒产品。 Better Auth 1.2.10版本至1.6.11之前版本存在安全漏洞，该漏洞源于SSO插件的POST /sso/register端点仅检查成员身份，未要求所有者或管理员角色，可能导致任意组织成员添加新的SSO提供商，从而允许攻击者控制的OIDC或SAML提供商进行组织配置。
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
better-auth better-auth >= 1.2.10, < 1.6.11 -
@better-auth sso >= 1.2.10, < 1.6.11 -

II. Public POCs for CVE-2026-53515

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6814 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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POC zip download
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III. Intelligence Information for CVE-2026-53515

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Patches & Fixes for CVE-2026-53515 (2)

Vendor Advisories for CVE-2026-53515 (1)

Vendor Pages for CVE-2026-53515 (1)

Same Patch Batch · better-auth · 2026-07-15 · 8 CVEs total

CVE-2026-53513 9.6 CRITICAL Better Auth: Server-side request forgery via unvalidated OIDC endpoints on @better-auth/ss
CVE-2026-53516 8.3 HIGH Better Auth: Account takeover via OAuth auto-link to unverified pre-registered email
CVE-2026-53517 8.1 HIGH Better Auth OAuth Provider: Refresh Token Rotation Race Condition Allows Concurrent Replay
CVE-2026-53514 7.7 HIGH Better Auth: Unauthorized invitation acceptance via unverified email match in organization
CVE-2026-45337 7.6 HIGH Better Auth: Device authorization approve and deny accept any authenticated session while
CVE-2026-53518 Better Auth OAuth Provider: Race Condition in Authorization Code Exchange Enables Multi-Us
CVE-2026-53512 Better Auth: OAuth refresh-token replay via missing client authentication on oidc-provider

IV. Related Vulnerabilities

Same product: better-auth
Same vendor: better-auth
Same weakness: CWE-269

V. Comments for CVE-2026-53515

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