Top 10 API Security Vulnerabilities
APIs are the connective tissue of modern applications, facilitating data transfer between microservices, mobile apps, and third-party integrations. As the primary gateway to enterprise data, APIs are heavily targeted. This list covers the most critical API vulnerabilities based on the OWASP API Security Top 10 and real-world breach data.
Broken Object Level Authorization (BOLA)
APIs failing to ensure the authenticated user has access to the specific object requested via an ID parameter.
Real World Case Study
A ridesharing application’s API endpoint `/api/v1/receipts/{receipt_id}` checked if the user was logged in, but not if they owned the receipt. Attackers rapidly cycled through sequential receipt IDs, scraping PII and trip details of millions of users leading to a massive regulatory fine.
The Precogs AI Fix
Precogs AI implements context-aware authorization middleware that automatically links the requested resource ID to the authenticated user's tenant boundary.
Notable CVEs in this Class
Broken Authentication
Flaws in authentication mechanisms such as weak password policies, missing brute-force protection, or exposed tokens.
Real World Case Study
A healthcare portal implemented an API with SMS-based 2FA but failed to rate-limit the validation endpoint. Attackers brute-forced the 6-digit pins, taking over thousands of patient accounts within an hour.
The Precogs AI Fix
Precogs AI enforces robust token lifecycle management, auto-injects rate-limiting strategies on authentication boundaries, and flags timing-attack vulnerable comparison operators.
Broken Object Property Level Authorization
Exposure of sensitive object properties to unauthorized users (Excessive Data Exposure) or allowing users to modify fields they shouldn't (Mass Assignment).
Real World Case Study
An enterprise SaaS platform returned the entire `User` object in JSON format upon login, including the `password_hash` and `is_superadmin` fields, relying on the frontend application to hide them. Attackers captured the traffic using Burp Suite and extracted the admin hashes.
The Precogs AI Fix
Precogs AI analyzes data serialization schemas (like GraphQL or DTOs) and enforces strict field stripping and allowlist masking prior to API responses.
Unrestricted Resource Consumption
APIs failing to restrict the number or size of requests, leading to Denial of Service (DoS) or massive cloud infrastructure bills.
Real World Case Study
A marketing API allowed clients to submit lists of URLs for bulk screenshot generation without limits. Attackers submitted a payload of 500,000 URLs, completely exhausting the backend GPU fleet and forcing the cloud instances to autoscale infinitely, resulting in a localized denial of service.
The Precogs AI Fix
Precogs AI integrates semantic memory boundaries, enforcing pagination limits and injecting strict Gateway-level rate-limiting primitives.
Broken Function Level Authorization
Complex access control policies with varying hierarchies and roles are incorrectly implemented, allowing regular users to access administrative APIs.
Real World Case Study
An API intended only for internal administrators at `/api/v2/admin/export_users` was not hardcoded with role checks, instead assuming the internal firewall would block access. An attacker pivoted through a low-privilege SSRF vulnerability to hit the API, dumping the entire database.
The Precogs AI Fix
Precogs AI maps route endpoints to strict Role-Based Access Control (RBAC) definitions directly via declarative decorators ensuring no API route is exposed without an explicit permission boundary.
Notable CVEs in this Class
Unrestricted Access to Sensitive Business Flows
APIs vulnerable to automated bot attacks because they expose high-value business logic (ticket purchasing, account creation) without bot protection.
Real World Case Study
A sneaker retailer's API endpoint for limiting shoe purchases was attacked by scalper bots. Because the API had no behavioral validation or CAPTCHA, the bots scripted the entire checkout flow in under 5 seconds, purchasing all stock before genuine human users could click 'buy'.
The Precogs AI Fix
Precogs AI identifies anomalous high-velocity endpoint invocations and seamlessly injects challenge-response (CAPTCHA / PoW) logic on sensitive business flow APIs.
Server-Side Request Forgery (SSRF) in APIs
An API accepts a URL from the user and fetches it, allowing attackers to access internal networks or cloud metadata.
Real World Case Study
A document conversion API accepted a URL to fetch a PDF. Attackers sent the internal Kubernetes API URL (`https://kubernetes.default.svc/api/v1/secrets`), exploiting the backend service account token to list all cluster secrets and compromise the entire deployment environment.
The Precogs AI Fix
Precogs AI implements strict egress allowlisting inside the HTTP client libraries, completely preventing outbound requests to private IPv4 ranges or internal DNS suffixes.
Security Misconfiguration
APIs deployed with verbose error messages, open CORS policies, misconfigured HTTP headers, or exposed debug endpoints.
Real World Case Study
A banking mobile app API was configured with a wildcard CORS policy (`Access-Control-Allow-Origin: *`) and allowed credentials. This enabled malicious websites to read authenticated JSON responses from the banking API silently when the victim visited the malicious site.
The Precogs AI Fix
Precogs AI scans application configurations globally to enforce strict CORS boundaries, disabling wildcards when credentials are true, and enforcing standard Security Headers.
Improper Inventory Management (Zombie APIs)
Old or undocumented API endpoints (like `v1` vs `v3`) left running in production without modern security controls.
Real World Case Study
A ride-sharing company enforced strict OAuth on `/api/v3/`, but left the legacy `/api/v1/` endpoints active for older mobile app versions. Attackers discovered the v1 endpoints lacked rate limiting and brute-forced millions of driver accounts successfully.
The Precogs AI Fix
Precogs AI conducts continuous DAST mapping of all exposed routes, comparing them against the OpenAPI schema, immediately flagging undocumented or deprecated active endpoints.
Unsafe Consumption of APIs
When an application blindly trusts data returned by third-party APIs without validation, leading to injection or logic flaws.
Real World Case Study
A financial aggregator pulled stock data from a third-party REST API. When the third-party provider was compromised, attackers inserted script payloads inside the 'ticker_name' field. The aggregator app stored and rendered this payload to its users, resulting in a cross-site scripting (XSS) compromise on the main dashboard.
The Precogs AI Fix
Precogs AI enforces schema validation on all inbound network data, ensuring third-party API payloads conform to strict data types before processing.