Why Token Revocation Is a System-Wide Problem, Not Just an Endpoint

A security analysis highlights a critical distinction between token theft prevention and token revocation in modern authentication systems. DPoP (RFC 9449) significantly reduces token portability by binding each request to a private proof key, making a stolen token alone largely useless to an attacker. However, if an attacker gains access to the client process, device, or active session, DPoP's protections no longer hold, as malicious code can exploit the legitimate signing context directly. Self-contained JWT access tokens introduce a separate risk: because they are validated locally without contacting the authorization server, a token can remain cryptographically valid even after an account is disabled or a device is flagged as compromised. The article argues that revocation must be treated as a distributed system-wide operation, not merely a cryptographic or endpoint-level concern.