EresusSecurity
API Security

Make real API abuse paths visible with proof.

Eresus validates object-level authorization, token lifecycle, rate limits, schema leakage, and microservice trust-boundary risks across REST, GraphQL, SOAP, gRPC, and WebSocket surfaces.

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Best fit

This engagement creates value fastest for teams like these.

Security and engineering leadership

Teams that need exploit-backed proof before they reprioritize application, API, cloud, or identity work.

Product teams with customer-facing risk

Organizations shipping auth-heavy, multi-tenant, regulated, or internet-exposed systems where logic and authorization flaws matter.

Buyers who need proof, not alert volume

Programs that want reproducible findings, remediation direction, and a closure path instead of scanner noise.

Scope

REST, GraphQL, SOAP, gRPC, and WebSocket coverage
OAuth, JWT, token, and session controls
Object/function-level authorization tests
Gateway, microservice, and service-boundary abuse scenarios

Risk signals

BOLA/IDOR access to another customer
Mass assignment and role escalation
GraphQL introspection and schema leakage
Rate limit, replay, and token abuse

Outcomes

API endpoint risk map
Executable request/PoC evidence
Authz middleware and policy guidance
Retest-ready validation checklist
Engagement model

Not scanner output. Offensive work that produces proof.

01

Scope and objective

We align assets, workflows, user roles, testing windows, and safe operating boundaries before execution starts.

02

Expert validation

Eresus analysts validate exploitability and business impact instead of forwarding automated scanner output.

03

Proof, fix, retest

Each finding ships with evidence, impact, remediation guidance, and retest steps so teams can close risk quickly.

FAQ

The questions buyers want answered early.

How do you scope this engagement?+
We start from assets, business workflows, authorization boundaries, and the attack paths that could create material risk. Scope is shaped around exploitability, not checklist volume.
How are pricing and engagement models structured?+
Pricing is transparent and based on asset surface, API complexity, role hierarchies, and environment constraints. We offer fixed-scope project audits as well as recurring validation retainers for continuous deployment pipelines.
What is the typical test duration and delivery timeline?+
Standard web and API assessments take between 5 to 15 business days depending on scope. Critical zero-day vulnerabilities are communicated immediately via encrypted channels during active testing rather than waiting for report finalization.
What deliverables and report formats do we receive?+
You receive an executive summary for leadership, reproducible PoC exploit chains with raw HTTP requests, CVSS v3.1 scoring, developer-ready remediation code snippets, and a formal compliance attestation letter.
Is retesting included to verify our security fixes?+
Yes. Every engagement includes a complimentary retest window within 30 days of report delivery to validate that fixes have been properly implemented without introducing regression flaws.
Do your reports satisfy DORA, NIS2, SOC 2, and KVKK requirements?+
Yes. Our testing methodology follows OWASP Top 10, PTES, and NIST SP 800-115 standards, providing the technical evidence and methodology documentation required by auditors for DORA Article 25, NIS2 Article 21, SOC 2 Type II, and KVKK technical measures.

We tie risk to business impact.

Findings do not stop at severity labels. We explain which customer workflow, data class, or operational objective is affected.

Deliverables work for engineers and executives.

Engineering teams get reproducible proof and remediation direction; leadership gets the risk narrative, priority, and closure status.

Related proof

Research and advisories that support this service motion.

Research

The Silent Assassin of Modern APIs: BOLA / IDOR Vulnerabilities and Their Impact

Why does the undisputed leader of the OWASP API Top 10, Broken Object Level Authorization (BOLA/IDOR), constantly evade WAF and DAST scanners? Defending...

Research

The Depths of BOLA and IDOR: Exploiting REST and GraphQL APIs

What is BOLA (Broken Object Level Authorization)? Discover how threat actors exploit access control logic in APIs and how autonomous agents eradicate them.

Research

API Security in Fintech Applications: Why WAFs Are Never Enough

Today, the digital lifeblood connecting banking software, crypto wallets, open banking integrations, and payment gateways is the API (Application...

Advisory

ERESUS-ADV-2026-002: Server-Side Request Forgery (SSRF) via Cloud Metadata Endpoints

Server-side request forgery in cloud-hosted URL fetch flows can expose metadata services, temporary IAM credentials, and internal configuration.

Advisory

Zero-Day Analysis: Authenticated SSRF in n8n-mcp (GHSA-4ggg-h7ph-26qr)

Authenticated SSRF in n8n-mcp multi-tenant HTTP mode allows attackers with a valid token to force server-side requests to internal and cloud metadata resources.

Next step

Let’s scope this work against the surface that matters most.

Whether this starts as a pilot, a single application, a critical API, an AI agent flow, or a wider program, we start from the highest-impact surface.

Book a security briefingRequest a scope review