OAuth, OIDC & SAML SSO Testing
SSO bugs turn one flaw into account takeover everywhere. We test your OAuth, OIDC and SAML flows for redirect abuse, token handling errors and signature bypasses.
What is OAuth, OIDC & SAML SSO Testing?
A single SSO flaw becomes account takeover everywhere it's trusted. We test your OAuth, OIDC and SAML flows for redirect abuse, token-validation errors and signature bypasses — the bugs that quietly unlock every connected application.
Single sign-on concentrates trust for convenience, which means one flaw in the flow can unlock everything that trusts it. A loose redirect_uri leaks an authorization code; a missing signature check accepts a forged token; a weak state parameter enables cross-site request forgery on login. We test your OAuth, OIDC and SAML implementations for these issues because the payoff of an SSO bug — account takeover across every connected app — is uniquely high.
SSO testing also protects a trust relationship that's easy to underestimate: every application that accepts your identity provider inherits its security. A single flaw in the flow doesn't affect one app — it affects the entire federation. That multiplier is why SSO bugs are prized by attackers and why the flows deserve dedicated, protocol-aware testing rather than a generic web pass.
OAuth, OIDC & SAML SSO Testing is a manual, exploit-driven assessment: real people attacking your target the way an adversary would, then proving each finding with a working proof of concept. It is not an automated scan with a logo on it — the point is to find and demonstrate the issues that actually put you at risk, and hand your team a clear plan to fix them.
Why it matters
Identity is the modern perimeter. One escalation path through Active Directory or your identity provider can hand an attacker the keys to every connected system, which is why these attacks appear in almost every major breach.
A oauth, oidc & saml sso testing engagement replaces guesswork with evidence. Instead of hoping your controls hold, you get a ranked, reproducible picture of where they don’t — before someone hostile finds the same gaps.
Industries & use cases
SSO testing matters for any platform offering 'log in with' or enterprise SSO, identity providers, and B2B products where a federation flaw affects many downstream applications.
What we test
Manual, exploit-driven coverage focused on real impact — not scanner noise.
- redirect_uri and open-redirect abuse
- Token validation and JWT flaws
- SAML signature and assertion bypass
- PKCE and state/nonce handling
- Cross-device and code-interception attacks
- Account linking and takeover paths
Signs you should run a oauth, oidc & saml sso testing
If any of these apply, testing is overdue.
- You offer 'log in with' or enterprise SSO
- You act as an identity provider or relying party
- You've integrated multiple apps behind one login
- You use JWTs across services
- A single login compromise would be catastrophic
Common vulnerabilities we find
The issues that show up again and again in oauth, oidc & saml sso testing — and the ones that actually get exploited.
redirect_uri abuse
Loose matching sends the auth code to an attacker.
Token validation flaws
Missing signature, audience or expiry checks on JWTs.
SAML signature bypass
Parser quirks accepting forged or unsigned assertions.
Weak state/nonce handling
Missing anti-CSRF and replay protections in the authorization flow.
Account linking and pre-hijack flaws
Linking logic that lets an attacker attach their identity to a victim's account.
JWT algorithm confusion / weak keys
Tokens accepted due to alg-confusion or weak signing keys.
Open redirect in auth flow
Redirect handling that leaks codes or tokens to attackers.
Insufficient token audience/expiry checks
Tokens accepted across contexts or long after they should expire.
Example attack chain
Real impact rarely comes from one bug — it comes from chaining several. A representative example:
Why choose webhook.press
Attacker mindset
We’re offensive security people who also build the free tools bug-bounty hunters use daily. We test the way real adversaries do — and prove it.
No scanner theatre
You get findings a human exploited and verified, ranked by real business risk — not an unfiltered tool dump padded to look thorough.
Fixed price, free retest
A clear quote after scoping, a report your team and auditors can use, and a free retest to confirm the fixes hold.
Our methodology
A structured, transparent process aligned to OWASP and PTES — with a named point of contact throughout.
Scoping & rules of engagement
We agree the exact targets, depth, timing and constraints for your oauth, oidc & saml sso testing, and set clear rules of engagement so testing is safe and predictable.
Reconnaissance & mapping
We enumerate the full attack surface — endpoints, roles, technologies and trust boundaries — and threat-model where an attacker would focus.
Manual testing & exploitation
We attack by hand, verifying and chaining weaknesses into real impact. Automated tooling supports coverage; humans find the logic and authorization bugs it can’t.
Analysis & risk rating
Each finding is validated, rated by real business risk rather than raw scanner severity, and de-duplicated so you get signal, not noise.
Reporting
You receive an executive summary for leadership and a technical section with reproducible PoCs, evidence and concrete, stack-specific remediation.
Free retest
After you remediate, we re-test the closed findings to confirm they are actually fixed — at no extra cost.
What you get
Reproducible PoCs
Every finding ships with a working proof and step-by-step reproduction your engineers can replay and verify.
Risk-ranked findings
Prioritised by real business impact, so you fix what matters first instead of drowning in low-severity noise.
Actionable remediation
Concrete, stack-specific fixes and guidance — not generic “apply best practice” filler.
Free retest
We re-check the closed findings after remediation and confirm they’re resolved.
The report is written for two audiences at once: an executive summary that a non-technical stakeholder can act on, and a detailed technical section — findings, evidence, CVSS and reproduction — that your developers and auditors can use directly.
Manual testing, not just a scan
Automated scanners are fast and useful for coverage, but they only find patterns they already know, and they flood you with false positives. They cannot understand your business logic, chain several small issues into a breach, or tell you which alert actually matters. Our oauth, oidc & saml sso testing is led by experienced testers who exploit findings by hand and rank them by the damage they’d really do — the difference between a 300-page tool dump and a short list of things worth fixing.
Standards & compliance
Our oauth, oidc & saml sso testing reports are written to support the frameworks your auditors and customers care about — including SOC 2, ISO 27001, PCI DSS, HIPAA, GDPR, and the EU’s NIS2 and DORA. Each engagement produces clear, independent evidence of testing with scope, methodology and findings documented the way assessors expect, so the same test both hardens your systems and helps satisfy your obligations.
Frameworks we follow
Recognised methodologies, adapted to your target — never a rigid checklist.
- OWASP — Web Security Testing Guide, ASVS and the API Security Top 10
- PTES — the Penetration Testing Execution Standard
- NIST SP 800-115 — technical guide to security testing
- OSSTMM — Open Source Security Testing Methodology Manual
- MITRE ATT&CK — to frame real-world adversary techniques
FAQ
Do you test our IdP or the integration?
Mainly the integration and flows — that's where most exploitable SSO bugs live — but IdP config is in scope too.
Which protocols?
OAuth 2.0/2.1, OpenID Connect and SAML 2.0, plus JWT handling throughout.
Do you test our IdP or the integration?
Primarily the flows and integration, where most exploitable SSO bugs live, with IdP configuration in scope too.
Which standards?
OAuth 2.0/2.1, OpenID Connect and SAML 2.0, plus JWT handling throughout.
Do you test JWT handling end to end?
Yes — signing, algorithm, audience and expiry validation across your services.
Do you cover cross-device and mobile flows?
Yes — including code-interception and cross-device attacks that affect real deployments.
How long does a oauth, oidc & saml sso testing take?
Most focused engagements run one to two weeks depending on scope; we agree the exact timeline during scoping.
Is a retest included?
Yes — after you remediate, we re-check the closed findings to confirm they’re fixed, at no extra cost.
How do you price it?
Per engagement, based on scope and depth — you get a fixed quote after a short scoping call. No cookie-cutter packages.
Why teams trust our oauth, oidc & saml sso testing
Aligned to recognised standards
Testing follows OWASP, PTES, NIST SP 800-115 and MITRE ATT&CK, and reports support SOC 2, ISO 27001, PCI DSS, HIPAA, GDPR, NIS2 and DORA.
Every engagement includes
Reproducible PoCs, risk-ranked findings, concrete remediation, a named point of contact, a free retest, and a summary letter of attestation.
Confidential by default
Work is covered by an NDA, scoped with clear rules of engagement, and data is handled with care throughout — including residency requirements.
Sample report available on request — see our reporting format and depth before you commit. Ask for a sample →
Get a quote for OAuth, OIDC & SAML SSO Testing
Tell us about the target — we’ll come back with scope and a fixed price. Manual, exploit-driven testing with reproducible proof and a free retest.