CVE WatchAug 1, 2026

CVE-2026-67333

better-auth before 1.6.13 (and pre-release builds 1.7.0-beta.0 through 1.7.0-beta.3) fail to validate the scheme of redirect_uris registered

CVSS

7.2

High

EPSS

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KEV

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Exploit Today

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0-100

Published: Aug 1, 2026 · Last modified: Aug 1, 2026 · CWE-79

EPSS · 30d

Not enough EPSS history yet.

Technical description

better-auth before 1.6.13 (and pre-release builds 1.7.0-beta.0 through 1.7.0-beta.3) fail to validate the scheme of redirect_uris registered via the deprecated oidc-provider plugin and the mcp plugin (which wraps the same provider). An attacker can register an OAuth client with a javascript: redirect_uri, which the authorization server later returns unchanged in the consent response. If the deployment's consent page navigates the browser to the returned redirectURI (e.g. assigning it to window.location.href), the attacker's JavaScript executes in the authorization-server origin, exposing the victim's session and enabling account takeover.

Official references

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