The Overlooked Risk in Passkey Adoption: How XSS Enables Persistent Backdoors

XSS vulnerabilities represent an overlooked but critical threat to passkey implementations, allowing attackers to register attacker-controlled credentials on victim accounts without user awareness. For organizations, this creates compounded risks: identity compromise, audit trail ambiguity, and regulatory exposure—transforming what appears to be a successful security control into a silent persistence backdoor. Effective defenses require understanding this threat model and implementing comprehensive mitigation strategies alongside passkey deployment.