Single sign-on concentrates trust — and a single flaw in the flow can unlock every connected application. Our SSO security testing targets OAuth 2.0, OpenID Connect and SAML implementations for the subtle mistakes that lead to account takeover: redirect and state handling, token validation and assertion parsing.
We test your identity provider and relying parties together, where most real bugs live.
Our SSO security testing targets OAuth 2.0, OpenID Connect and SAML implementations across your identity provider and relying-party applications. We test redirect_uri and state handling, authorization-code and PKCE flows, JWT and id_token validation, SAML assertion and signature verification, token replay and scope escalation — aligned to the OAuth 2.0 Security Best Current Practice (RFC 9700) and OWASP ASVS. Most real SSO vulnerabilities live at the boundary between the IdP and the apps, which is exactly where we focus.
Why it matters
Single sign-on concentrates trust, so a single flaw in the login flow can unlock every connected application at once. Redirect handling, token validation and SAML assertion parsing are subtle and frequently implemented incorrectly.
SSO security testing targets OAuth 2.0, OpenID Connect and SAML implementations for the exact mistakes that lead to account takeover, assessing your identity provider and relying parties together where most real bugs live.
What we test
- redirect_uri & state parameter abuse
- Authorization code & PKCE flaws
- JWT/id_token validation weaknesses
- SAML assertion & signature bypass
- Token replay & scope escalation
- IdP and relying-party trust gaps
Common vulnerabilities we uncover
- redirect_uri and state parameter abuse
- Authorization code and PKCE flaws
- JWT and id_token validation weaknesses
- SAML assertion and signature bypass
- Token replay and scope escalation
- IdP and relying-party trust gaps
Our OAuth, OIDC & SAML SSO Security Testing methodology
- Scoping & rules of engagement. We agree objectives, targets and boundaries for your oauth, oidc & saml sso security testing, so testing is safe, authorized and focused on what matters to your business.
- Reconnaissance & mapping. We enumerate the full attack surface in scope, building a complete picture before any exploitation begins.
- Manual exploitation. Our senior testers chain vulnerabilities by hand — going far beyond automated scanners — to prove real, demonstrable impact.
- Analysis & reporting. Every finding is triaged, risk-rated with CVSS and written up with a copy-paste reproduction and clear remediation.
- Remediation support & free retest. We support your team through the fixes and retest the remediated issues to confirm they are genuinely closed.
Tools & techniques
We test SSO flows manually with Burp Suite and protocol-specific tooling, intercepting and manipulating authorization requests, tokens and assertions. We test redirect and state handling, PKCE, JWT and id_token validation, and SAML assertion and signature verification across your identity provider and relying-party apps, mapped to the OAuth 2.0 Security BCP (RFC 9700) and OWASP ASVS.
When you need OAuth, OIDC & SAML SSO Security Testing
- For applications using SSO, social login or federation
- When integrating OAuth, OIDC or SAML with third parties
- Before rolling out a new identity provider or SSO flow
- To prevent account-takeover through SSO flaws
What you receive
- SSO flow security findings
- Account-takeover PoCs where present
- Implementation hardening guidance
- Free retest after remediation
What’s included in your report
Every oauth, oidc & saml sso security testing engagement concludes with a comprehensive, board-ready report and a working session to walk your team through it. Your report includes:
- An executive summary with overall risk posture for non-technical stakeholders
- Detailed technical findings, each with a step-by-step, copy-paste reproduction
- CVSS v3.1 severity ratings and business-impact context for every issue
- Prioritized, actionable remediation guidance your engineers can apply directly
- A complimentary retest to confirm fixes and update finding status
- A formal attestation letter for customers, auditors and compliance programs
Standards & frameworks
OWASP ASVS
OAuth 2.0 Security BCP (RFC 9700)
OWASP WSTG
Outcomes you can expect
After your oauth, oidc & saml sso security testing, you will have clear, evidence-based visibility into your real security risk — not a scanner’s guesswork. You will know exactly which weaknesses an attacker could exploit, what the business impact would be, and the precise steps to fix them in priority order. Teams use our findings to close critical gaps, satisfy customer and regulator security requirements, and demonstrate due diligence to their board. With a complimentary retest included, you also get documented proof that the issues are genuinely resolved.
Engagement details & logistics
Every oauth, oidc & saml sso security testing starts with a short, no-obligation scoping call to understand your goals, environment and constraints, followed by a fixed-price proposal and a clear statement of work. Most engagements are delivered fully remotely, with on-site work arranged where it genuinely adds value. Throughout testing we maintain an agreed communication cadence and escalate any critical, high-impact finding to you immediately rather than waiting for the final report. All work is performed under a signed NDA with strict data-handling controls, using safe, non-disruptive techniques and carefully coordinated rules of engagement to protect your production systems. On completion you receive your report and a walkthrough session, followed by a complimentary retest once your fixes are in place. Typical engagements are booked one to three weeks in advance, and urgent or pre-deadline testing can often be accommodated — just ask at hi@agentoffense.com.
Why organizations choose AgentOffense for OAuth, OIDC & SAML SSO Security Testing
Our oauth, oidc & saml sso security testing is delivered by senior offensive-security engineers who test the way real attackers do — manually, creatively and with a relentless focus on proving genuine, demonstrable impact. Here is what sets our engagements apart:
- Manual, exploit-driven testing that chains vulnerabilities the way a real attacker would, going far beyond what automated scanners can find.
- Reproducible proof for every finding, with copy-paste reproduction steps your engineers can follow and independently verify.
- Honest severity calibration so you invest in fixing what genuinely matters and avoid wasting effort on false positives and noise.
- Clear, business-focused reporting that speaks to engineers and executives alike, tying every issue to real-world impact.
- A complimentary retest included, so you get documented proof that your fixes actually close the attack path.
- Responsible, collaborative delivery with a named point of contact and secure handling of all data throughout the engagement.
Explore related services
OAuth, OIDC & SAML SSO Security Testing is frequently scoped alongside our other offensive-security services for broader coverage. Explore related engagements that complement it:
Frequently asked questions
Do you test our IdP or the applications?
Both. Most SSO vulnerabilities emerge at the boundary between the identity provider and the relying-party applications, so we assess the full flow.
Can you test custom or third-party SSO?
Yes — Keycloak, Auth0, Okta, Entra ID, Ping and custom implementations are all in scope.
Is JWT tampering part of this?
Yes. Algorithm confusion, weak signature validation and claim manipulation are core checks in every SSO assessment.
Do you test our IdP or the applications?
Both. Most SSO vulnerabilities emerge at the boundary between the identity provider and the relying-party applications.
Can you test custom or third-party SSO?
Yes — Keycloak, Auth0, Okta, Entra ID, Ping and custom implementations are all in scope.
Which SSO providers can you test?
Keycloak, Auth0, Okta, Entra ID, Ping and custom implementations are all in scope, on both the IdP and application sides.
Is JWT tampering included?
Yes — algorithm confusion, weak signature validation and claim manipulation are core checks in every SSO assessment.
How long does SSO security testing take?
Typically one to two weeks depending on the number of flows and applications, plus a retest window.
Which providers do you support?
Keycloak, Auth0, Okta, Entra ID, Ping and custom implementations, on both the identity-provider and application sides.