Bobby Ho
395e8032dc
fix: reject client_secret in the OAuth2 token and revocation URL ( #29508 )
...
Reject non-empty `client_secret` query parameters on token and revocation endpoints with `400 invalid_request`, enforcing OAuth 2.1 §2.4.1 (D6-04).
- **Breaking:** Send secrets in the request body or `Authorization` header, and rotate any previously sent in URLs. Rejections consume nothing, so clients can retry without reauthorization.
- Empty query secrets count as absent, but token requests also supplying a body secret still fail duplicate-parameter validation. Authorize ignores query secrets and logs a warning without the value.
- Sanitize and cap revocation parse errors, correctly report repeated token parameters, and update tests and API docs. Refusal logs include the app ID, never the secret.
- Other query parameters (`client_id`, `refresh_token`, `code`, and revocation tokens) remain accepted; body-only credential parsing is tracked in PLAT-660.
No migration or new error codes.
Refs PLAT-602.
2026-09-22 23:20:24 +00:00
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