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CVE-2026-67328 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:7.4 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CNA: [email protected]CVSS-B:8.1 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/better-auth/better-auth/security/advisories/GHSA-prpr-5gj3-qqhg	[email protected]	AdvisoryRemedyVendor
https://www.vulncheck.com/advisories/better-auth-sso-before-account-takeover-via-sso	[email protected]	AdvisoryBundle

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-79	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')	[email protected]

Affected Products

Product	Versions
better-auth/sso	<= 1.6.20 (semver) >= 1.7.0-beta.0, < 1.7.0-beta.10 (semver)
CPE No CPEs found in CPE dictionary for this product. Remediation Upgrade: 1.6.21moderate effort Upgrade: 1.7.0-beta.10moderate effort Workaround:low effort Disable self-service SSO registration by setting `providersLimit: 0`. Workaround:low effort Disable implicit account linking by setting `account: { accountLinking: { disableImplicitLinking: true } }`. Workaround:low effort Verify that no rows in the `ssoProvider` table contain a `domain` value with `://`, `/`, `?`, `#`, or a comma. Verify that no rows in the `account` table have a `providerId` with no matching provider. Mitigation:low effort Prefer pre-validated `defaultSSO` providers for SAML. Avoid sharing one IdP signing certificate across service providers when assertions are not audience-scoped. Mitigation:low effort Leave `saml.enableSingleLogout` disabled (the default) unless it is required.

Product

Versions

better-auth/sso

<= 1.6.20 (semver)

>= 1.7.0-beta.0, < 1.7.0-beta.10 (semver)

CPE

No CPEs found in CPE dictionary for this product.

Remediation

Upgrade: 1.6.21moderate effort
Upgrade: 1.7.0-beta.10moderate effort
Workaround:low effort
Disable self-service SSO registration by setting `providersLimit: 0`.
Workaround:low effort
Disable implicit account linking by setting `account: { accountLinking: { disableImplicitLinking: true } }`.
Workaround:low effort
Verify that no rows in the `ssoProvider` table contain a `domain` value with `://`, `/`, `?`, `#`, or a comma. Verify that no rows in the `account` table have a `providerId` with no matching provider.
Mitigation:low effort
Prefer pre-validated `defaultSSO` providers for SAML. Avoid sharing one IdP signing certificate across service providers when assertions are not audience-scoped.
Mitigation:low effort
Leave `saml.enableSingleLogout` disabled (the default) unless it is required.

Change History

2 change records found show changes

Date	Action	Recorded By
Aug 3, 2026	CVE Modified	CISA-ADP
Aug 1, 2026	New CVE Received	[email protected]