CVE-2026-67333
CVE-2026-67333 · better-auth before 1.6.13 Stored XSS via javascript redirect_uri
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 5.1 · Medium · EPSS 0.3% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
better-auth
- Versions
- ≥ 0, < 1.6.13: Affected (semver)
- 1.6.13: Not affected (semver)
Update to 1.6.13
better-auth
- Versions
- ≥ 1.7.0-beta.0, < 1.7.0-beta.4: Affected (semver)
- 1.7.0-beta.4: Not affected (semver)
Update to 1.7.0-beta.4
better-auth npm
- Affected ranges
- SEMVER: < 1.6.13
Update to 1.6.13
better-auth npm
- Affected ranges
- SEMVER: ≥ 1.7.0-beta.0, < 1.7.0-beta.4
Update to 1.7.0-beta.4