What is CVE-2026-67331?

CVE-2026-67331 is a high-severity vulnerability in Better-Auth Scim, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.3/10. Published 2026-08-01.

How severe is CVE-2026-67331?

High severity. CVSS v3 base score is 8.3 out of 10.

Auth bypass in Better-Auth Scim

CVE-2026-67331

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.

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.003 (22.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L.

Affected products

Better-auth Scim — versions 1.5.0, 1.7.0-beta.4

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-67331?: CVE-2026-67331 is a high-severity vulnerability in Better-Auth Scim, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.3/10. Published 2026-08-01.
How severe is CVE-2026-67331?: High severity. CVSS v3 base score is 8.3 out of 10.