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Vulnerability record · CVE-2026-67328 · published 1 August 2026

CVE-2026-67328: Cross-site scripting vulnerability

@better-auth/sso versions before 1.6.21 contain multiple authentication bypass vulnerabilities in SSO provider handling that allow attackers to sign in as arbitrary users. Attackers can exploit domain verification parsing mismatches, orphaned provider accounts, unbound SAML assertions, or reflected XSS on logout endpoints to gain unauthorized session access and account takeover.

8.6 CVSS 4.0 High EPSS 0.49% · top 60.2% CWE-79 · Cross-site scripting Deferred
8.6CVSS 4.0 base score
0.49%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
8 Sep 2026Last modified by NVD

Description

@better-auth/sso versions before 1.6.21 contain multiple authentication bypass vulnerabilities in SSO provider handling that allow attackers to sign in as arbitrary users. Attackers can exploit domain verification parsing mismatches, orphaned provider accounts, unbound SAML assertions, or reflected XSS on logout endpoints to gain unauthorized session access and account takeover.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/better-auth/better-auth/security/advisories/GHSA-prpr-5gj3-qqhg
https://www.vulncheck.com/advisories/better-auth-sso-before-account-takeover-via-sso

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Source: NIST National Vulnerability Database (record CVE-2026-67328), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.