Broken access control is the #1 application risk. Make authorization a primitive, not an afterthought.
B2B SaaS builders own multi-tenant isolation, customer trust, and the OWASP #1 risk — broken access control. B5 Secure makes per-action, per-tenant authorization a declarative .NET primitive enforced at the call site, so a tenant boundary can’t be crossed by a check someone forgot to write.
Multi-tenant isolation is one missing check away from a breach.
In SaaS, the worst incidents are rarely exotic exploits — they are a missing or wrong authorization check that lets one tenant reach another’s data, or a user escalate privilege. Broken access control is OWASP’s number-one application security risk precisely because it is easy to get subtly wrong in hand-written code. B5 makes the authorization decision declarative and bound to the method, so the tenant and record boundary is enforced everywhere, by construction.
What your customers’ security teams require — mapped to enforcement.
Make authorization demonstrable, and turn the customer security review from a gate into a close.
| Framework | What it requires | How B5 enforces it |
|---|---|---|
| SOC 2 (Security / Confidentiality) | Logical access controls and least privilege | Per-action [Permission] enforcement and execution-point audit |
| ISO/IEC 27001 | Access control policy and segregation | Deny-by-default authorization bound to each method |
| OWASP Top 10 (A01) | Prevent broken access control and IDOR/BOLA | Record-scoped, in-code authorization that cannot be bypassed at the object |
| Customer DPAs | Tenant data isolation and least privilege | Per-tenant authorization enforced at the call site, inside your boundary |
| NIST SSDF (your SDLC) | Secure development and supply-chain provenance | SBOM, signed packages, and SLSA provenance for your own releases |
Authorization as a primitive you compile in.
Stop scattering checks through controllers; bind the decision to the method and enforce it everywhere by construction.
Per-tenant, data-element authority
Authorize down to the tenant, object, and field at the method — the structural defense against IDOR/BOLA.
Declarative, not hand-written
[Permission] on the methods that matter replaces ad-hoc checks that drift and get forgotten.
Scoped API keys
Service-Key grants an integration only the endpoints it needs — least privilege at the credential level.
Agent- and automation-ready
Treat agents and automation as first-class principals with delegated, ceilinged scope enforced per call.
A stronger Trust Center
A library that holds no customer data publishes a shorter, more credible Trust Center — faster customer reviews.
In your boundary
Enforcement runs inside your service; no authorization data copied to an external store on the hot path.
Agentic features in your product, governed.
In-app AI agents
Ship AI features whose agents act only within the calling tenant’s and user’s delegated scope.
Scoped partner access
Partner integrations receive least-privilege keys bound to specific endpoints and records.
Enforced tenant isolation
The tenant boundary is enforced at every method, not dependent on a check a developer remembered.
B5 is your enforcement layer, not your IdP.
Complements Auth0/Okta/Entra and your gateway.
B5 does not replace your CIAM or API gateway — it consumes their identities and enforces what each caller may do at the method. For .NET SaaS, B5 is the structural fix for broken access control: authorization becomes a declarative primitive enforced everywhere, inside your own service, so a missing check can’t become a cross-tenant breach.
Make broken access control a solved problem.
See how B5 turns per-tenant authorization into a .NET primitive enforced at the call site — and a Trust Center that closes deals.
Regulated-grade enforcement, at the record.
Thirty minutes with a B5 engineer: your industry’s obligations, the B1–B5 pipeline, and a data-element authorization decision you can watch happen — with the evidence trail your examiners ask for.