@better-auth/oauth-provider before 1.7.0-beta.4 Authorization Bypass
Priority LOW 24CWE-285Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-285.
Summary
@better-auth/oauth-provider before 1.7.0-beta.4 fails to bind access-token audience to the authorization grant, allowing clients to request tokens for unrelated resources. Attackers can complete an OAuth flow and obtain access tokens whose audience targets resource servers the authorization never covered, bypassing intended authorization boundaries.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0026 17th percentileScored 2026-11-07
Fix Fixed oauth-provider (better-auth): 1.7.0-beta.4
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| better-auth | oauth-provider | 1.4.8 to before 1.7.0-beta.4 | 1.7.0-beta.4 | Patch available | CNA |
- oauth-provider Vendorbetter-auth Affected 1.4.8 to before 1.7.0-beta.4 Fixed in 1.7.0-beta.4 Patch available CNA
Remediation
- Fix · CNA oauth-provider (better-auth) Fixed in 1.7.0-beta.4
Timeline
- 2026-10-02 Threatist record created from CVE-2026-67332
- 2026-10-03 Alias added: GHSA-hq9c-fvm2-pfh9
References
More better-auth vulnerabilities
- TI-2025-38277 Better Auth: Unauthenticated API key creation through api-key plugin CVSS 4.0CRITICAL 9.3
- TI-2026-47627 better-auth SCIM 1.5.0 before 1.7.0-beta.4 Authorization Bypass CVSS 4.0HIGH 8.7
- TI-2025-20000 Beter Auth has an Open Redirect via Scheme-Less Callback Parameter CVSS 4.0MEDIUM 6.9
- TI-2026-13066 better-auth better-icons scan_project_icons/sync_icon path traversal CVSS 4.0MEDIUM 4.8
- TI-2026-79320 OAuth state accepted as Magic Link token in Better Auth CVSS 3.1CRITICAL 9.1
- TI-2026-74552 Authentication bypass in Better Auth Magic Link verification CVSS 4.0CRITICAL 9.3
Sources
- CVE-2026-67332 · CVE Program
- CVE-2026-67332 · NVD
- FIRST EPSS
- GHSA-hq9c-fvm2-pfh9 · GitHub Advisory Database · CC BY 4.0
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