CVE-2026-41427 | better-auth oauth-provider up to 1.6.4/1.7.0-beta.1 OAuth Client Creation Endpoint authorization

VDB-359551 · CVE-2026-41427 · EUVD-2026-25617 BETTER-AUTH OAUTH-PROVIDER UP TO 1.6.4/1.7.0-BETA.1 OAUTH CLIENT CREATION ENDPOINT AUTHORIZATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.1 $0-$5k 3.38 Summaryinfo A vulnerability has been found in better-auth oauth-provider up to 1.6.4/1.7.0-beta.1 and classified as problematic. Impacted is an unknown function of the component OAuth Client Creation Endpoint. This manipulation causes authorization. This vulnerability is handled as CVE-2026-41427. The attack can be initiated remotely. There is not any exploit available. The affected component should be upgraded. Detailsinfo A vulnerability classified as problematic was found in better-auth oauth-provider up to 1.6.4/1.7.0-beta.1. Affected by this vulnerability is an unknown part of the component OAuth Client Creation Endpoint. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-863. 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. This allows attackers to bypass intended access restrictions. As an impact it is known to affect integrity. The summary by CVE is: Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.5, the clientPrivileges option documents a create action, but the OAuth client creation endpoints did not invoke the hook before persisting new clients. Deployments that configured clientPrivileges to restrict client registration were not actually restricted — any authenticated user could reach the create endpoints and register an OAuth client with attacker-chosen redirect URIs and metadata. This vulnerability is fixed in 1.6.5. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-41427 since 04/20/2026. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available. Upgrading to version 1.6.5 eliminates this vulnerability. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-25617). Productinfo Vendor better-auth Name oauth-provider Version 1.6.0 1.6.1 1.6.2 1.6.3 1.6.4 1.7.0-beta.0 1.7.0-beta.1 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 4.3 VulDB Meta Temp Score: 4.1 VulDB Base Score: 4.3 VulDB Temp Score: 4.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Authorization CWE: CWE-863 / CWE-285 / CWE-266 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: oauth-provider 1.6.5 Timelineinfo 04/20/2026 CVE reserved 04/24/2026 +4 days Advisory disclosed 04/24/2026 +0 days VulDB entry created 04/25/2026 +0 days VulDB entry last update Sourcesinfo Advisory: github.com Status: Confirmed CVE: CVE-2026-41427 (🔒) GCVE (CVE): GCVE-0-2026-41427 GCVE (VulDB): GCVE-100-359551 EUVD: 🔒 Entryinfo Created: 04/24/2026 21:57 Updated: 04/25/2026 00:53 Changes: 04/24/2026 21:57 (66), 04/25/2026 00:53 (1) Complete: 🔍 Cache ID: 99:92A:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸