Guide · Cybersecurity
How Hackers Abuse Public APIs
Public APIs are high-value targets. Here's how attackers find and abuse them—and how to protect yours.
Public AI/API surfaces need identity and tool safety—anonymous privileged paths fail the gate. Primary control: Authentication
If it's on the internet, someone will farm it
Public endpoints attract scrapers, cost amplifiers, and DoS scripts—bots don't need a CVE when unlimited GETs are enough. An unauthenticated "quote" API returned signed price objects; attackers seeded a competing storefront and burned paid geolocation lookups on every hit. API keys beyond static content plus edge bot rules cut both the scrape and the surprise lookup bill.
Hardening that actually slows attackers
Rate-limit per IP and per key. Put WAF/bot management in front (Cloudflare or AWS WAF). Require auth for anything that costs money or exposes proprietary data. Alert at 50%/80%/100% of expected spend and on request-volume anomalies. Review usage weekly—abuse often looks like "growth" until you sort by IP.
Public surface = security domain work
APRF Infrastructure and Authentication treat internet-facing APIs as gated surfaces: throttle, authenticate, and watch. Pair with scraping and rate-limit guides when you're closing a live incident.
Next: Authentication
Open the related pillar specification for mandatory checks, artifacts, and pass conditions. Self-attest is optional.
Related
Frequently asked questions
- How do hackers abuse public APIs?
- They use bots and scripts to send unlimited requests—scraping data, racking up costs, or overwhelming servers. Rate limiting, WAF rules, and auth help prevent it.
- How do I protect my public API?
- Add rate limiting, WAF rules, and billing alerts. Require API keys for sensitive endpoints. Monitor usage weekly.
- What is the first step to protect an API?
- Add rate limiting. It's the fastest way to slow down abuse. Then add WAF rules, auth for sensitive endpoints, and billing alerts.