OAuth - More OBroken Than You Think
OBroken is here. The first tool to autonomously find, exploit and prove OAuth authorization bypasses end to end.
Our proprietary OAuth Authorization Bypass Scanner, covers 23 techniques across 17 vulnerability classes, each confirmed with a standalone Find/Forge/Fire PoC ready to report and collect.
Part of the Broken Token series alongside jBroken, our JWT scanner with 40+ techniques. Same methodology, same output format, different protocol layer.
The screenshot below shows oBroken running against the Missing aud Validation test case (CVE-2025-9803) on our OAuth testbed.
The tool scrapes the client app, discovers the AS, requests a token bound to an attacker-controlled resource, presents it to the real API and confirms it's accepted without audience validation.
One URL in, full PoC out.
Covers response mode escape, state manipulation, PKCE downgrade variants, DCR abuse, race conditions and aud validation, among others.
Running on our lab terminal today, landing on an private API someday. If you have interest, let us know.
Testbed below.
OAuth Bypass Testbed
403.brutelogic.net/authz/oau…
Test your skills against a LOGIN (randomly vulnerable) and/or 17 AUTHENTICATION SERVER endpoints.
Like with JWT (JBroken), our fully automated OAuth tool (OBroken) with complete FFF (Find, Forge, Fire) PoCs, aces this testbed.