> CVE-2026-53515 [HIGH]

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PUBLISHED
2026-07-15 18:16
MODIFIED
2026-07-15 18:16
CVSS_SCORE V3
7.1
EPSS (Prob. Exploit)
0.43%
Top 64.2%
DATA SOURCES:
NVD 🔗 2026-07-15 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-10-25 GITHUB 🔗 2026-10-29 OSV 🔗 2026-07-18

> 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.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
EXPLOITABILITY
2.8
IMPACT
4.2

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
Low (L)
Authentifié avec compte utilisateur basique
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
Low (L)
Divulgation limitée d'informations
I (Impact Intégrité)
Integrity Impact
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
Low
Divulgation limitée d'informations
Intégrité
High
Modification totale des données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-269 CWE-285 CWE-863

> CWE DETAILED DESCRIPTIONS

CWE-269: Improper Privilege Management - The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. | CWE-285: Improper Authorization - The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. | CWE-863: Incorrect Authorization - The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

> GITHUB SECURITY ADVISORY

GHSA-gv74-j8m3-fg5f HIGH

@better-auth/sso: SSO provider may allow registration for any org member without a checking their role

AFFECTED PACKAGES:
NPM / @better-auth/sso
>= 1.2.10, < 1.6.11
Fixed in: 1.6.11

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

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

AFFECTED PACKAGES:
Unknown / Unknown
336 versions affected
ALIASES:
GHSA-gv74-j8m3-fg5f

> HISTORIQUE DES MODIFICATIONS

Première apparition
15/07/2026 18:16
Source: NVD
📊 ENRICHISSEMENT 01/08/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-269: Improper Privilege Management - The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. | CWE-285: Impr...
Total des modifications: 1 Dernière mise à jour: 3 months ago

> REFERENCES

https://github.com/better-auth/better-auth/commit/86765f1597378f5c3deed1b80ca91f...
https://github.com/better-auth/better-auth/pull/9220
https://github.com/better-auth/better-auth/releases/tag/v1.6.11
https://github.com/better-auth/better-auth/security/advisories/GHSA-gv74-j8m3-fg...
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