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Sunday, 13 September 2026
8 agent hacks today▲ 7 vs yesterday (1)
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Incident database

better-auth redirect URI validation bypass enables XSS

better-auth before version 1.6.13 fails to validate redirect URI schemes, allowing attackers to register OAuth clients with javascript: URIs that execute in the authorization server's origin, potentially exposing user sessions and enabling account takeover.

Disclosed 1 August 2026 · Record updated 13 September 2026

Impact

Attackers can execute arbitrary JavaScript in the authorization server's origin, exposing victim sessions and enabling account takeover through maliciously registered OAuth clients.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-67333