better-auth SCIM 1.5.0 before 1.7.0-beta.4 Authorization Bypass
Priority HIGH 71CWE-639Published · 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
- High · High · Low
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.
Summary
better-auth SCIM versions from 1.5.0 before 1.7.0-beta.4 fail to bind non-organization SCIM providers to their creator by default, allowing authenticated users to manage other users' providers. Attackers can regenerate SCIM bearer tokens, invalidate legitimate tokens, and authenticate to SCIM API routes with the attacker-controlled token.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00388 33rd percentileScored 2026-11-07
Fix Fixed scim (better-auth): 1.7.0-beta.4
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- 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 | scim | 1.5.0 to before 1.7.0-beta.4 | 1.7.0-beta.4 | Patch available | CNA |
- scim Vendorbetter-auth Affected 1.5.0 to before 1.7.0-beta.4 Fixed in 1.7.0-beta.4 Patch available CNA
Remediation
- Fix · CNA scim (better-auth) Fixed in 1.7.0-beta.4
Timeline
- 2026-10-02 Threatist record created from CVE-2026-67331
- 2026-10-03 Alias added: GHSA-gj37-5j8h-j367
References
More better-auth vulnerabilities
- TI-2025-38277 Better Auth: Unauthenticated API key creation through api-key plugin CVSS 4.0CRITICAL 9.3
- 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
- TI-2026-84923 Unchecked state signing in @better-auth/expo enables account takeover CVSS 3.1CRITICAL 9.1
Sources
- CVE-2026-67331 · CVE Program
- CVE-2026-67331 · NVD
- FIRST EPSS
- GHSA-gj37-5j8h-j367 · GitHub Advisory Database · CC BY 4.0
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