Bot attacks happen when automated scripts hit your website or API to guess passwords, create fake accounts, scrape data, abuse promotions or flood your servers, usually because there are no rate limits, bot checks or edge protection.
Reviewed by: Codersarts Security Engineering Team · Last updated: November 2026
What it means when bots attack your website
Bot attacks are automated scripts that hit your site or API thousands of times: testing stolen passwords on your login, creating fake accounts, scraping your content, abusing free trials and coupons, or flooding the site until it slows down.
The fix isn't a CAPTCHA on every page. It's layered protection: blocking known bad traffic at the edge, limiting how often anyone can hit sensitive endpoints, and challenging only suspicious requests.
Symptoms: you're in the right place if
Hundreds of fake accounts appear, often with similar emails
Failed login attempts spike, or users report account takeovers
Your prices, listings or content show up on other sites
SMS or OTP costs jump without more real users
The site slows down or goes offline during traffic spikes
Coupons or free trials are used far more than expected
Bots are cheap to run and never get tired. If an endpoint has no limits, it will eventually be abused.
Business function
Business functions affected: Engineering, Growth, and Finance.
Typical owner: CTO or lead engineer, often pushed by growth or finance teams.
Common stage: Products with public sign-up, free trials, valuable content or prices, and any app that starts getting traction.
Is this the right help for you?
A good fit if:
Bots are creating accounts, hitting logins or scraping data
SMS, cloud or AI costs are rising from abuse
You need protection that doesn't hurt conversion
Your server is directly reachable from the internet
Not the right fit if:
Your app was actually broken into: see app got hacked
You're facing a very large DDoS that needs an enterprise contract with your provider
First steps against a bot attack
Put your site behind a CDN or WAF such as Cloudflare if it isn't already
Add rate limits to login, sign-up and OTP endpoints
Turn on a challenge for suspicious traffic on sign-up and login forms
Block your server from accepting traffic that doesn't come through the CDN
Business impact: what it costs to leave it unfixed
Account takeovers: credential stuffing breaks into real users' accounts.
Costs: SMS, cloud and AI bills rise with fake traffic.
Bad data: fake users ruin analytics and email reputation.
Downtime: floods slow or crash the site for real customers.
Root causes: why bots get through
No rate limits
Endpoints accept unlimited requests from one user or IP.
Origin exposed
Attackers skip your CDN by hitting the server's IP directly.
No bot detection
Nothing tells automated traffic from real people.
Valuable free actions
Sign-ups, OTPs, trials and coupons cost you money and give bots a reason to abuse them.
Common bot attack scenarios
Scenario | Usual cause | First fix |
|---|---|---|
Credential stuffing on login | No per-account or per-IP limits | Rate limits, breached-password checks, MFA |
Fake sign-ups and OTP abuse | No limits or challenges | Limits per IP and phone, Turnstile on sign-up |
Price and content scraping | Unprotected listing pages and APIs | Bot rules and rate limits at the edge |
Site slows during floods | No edge protection | WAF, caching and origin lockdown |
Bot protection checklist
Every “no” is a likely gap.
Edge
Is the site behind a WAF or CDN?
Does the origin accept traffic only from the CDN?
Limits
Do login, sign-up, OTP and search have rate limits?
Do limits work across all servers, not per server?
Detection
Are suspicious requests challenged?
Do you get alerts on traffic spikes?
Potential solution family
Solution type: Protect. We stop abuse without hurting real users.
Solution family: Edge security and abuse prevention: WAF, rate limiting, bot detection and origin lockdown.
How we fix it: stopping bot attacks
1. Analyze traffic
Find the abused endpoints and how bots behave.
2. Protect the edge
Set up a WAF with managed and custom rules.
3. Add rate limits
Per-IP, per-account and per-endpoint limits.
4. Challenge bots
Turnstile or CAPTCHA only on suspicious traffic and sensitive forms.
5. Lock the origin
Only the CDN can reach your servers.
6. Monitor
Dashboards and alerts for abuse spikes.
Typical timeline
Phase | Typical duration |
|---|---|
Emergency edge setup | Same day |
WAF and rate limits | 1–3 days |
Tuning in log mode | 1–2 weeks |
Application-level limits | 3–7 days |
Basic protection can be live the same day. Tuning removes false positives so real users aren't affected.
Mistakes to avoid
Adding CAPTCHA to every page and losing real users
Limiting only by IP, which blocks offices and misses rotating bots
Turning on WAF blocking without testing
Leaving the origin server reachable directly
Required skills
WAF and DDoS protection: edge rules and origin lockdown.
Rate limiting and bot protection: limits and challenges.
Authentication security: protecting accounts from credential stuffing.
Scalability: handling traffic spikes.
Relevant technologies
Edge: Cloudflare, AWS WAF and Shield, Azure Front Door and Google Cloud Armor
Rate limiting: Redis, Nginx and API gateways
Bot challenges: Cloudflare Turnstile and CAPTCHA
Diagnosis offer: start with a fixed-price Cloudflare WAF setup
Get edge protection, rate limits and bot rules in place, tuned for your users.
What you get:
WAF with managed and custom rules
Rate limits on sensitive paths
Bot challenges on login and sign-up
Origin lockdown
A short runbook for attacks
Proof
Example engagement: booking site buried in fake sign-ups
An illustrative example based on the pattern we see most often. Client details are kept confidential.
The situation: A booking platform saw thousands of fake sign-ups a day and rising SMS verification costs.
What we found:
No rate limits on sign-up or OTP
The origin server was reachable directly
Credential stuffing on the login page
What we changed:
Moved the site behind Cloudflare with tuned rules
Added limits per IP and phone number
Added Turnstile to sign-up
Locked the origin to Cloudflare only
The result: Fake accounts dropped to near zero, SMS costs returned to normal and real users weren't affected.
Why buyers trust Codersarts
Delivering software, cloud and security engineering for clients worldwide since 2018
A managed in-house engineering team, not a freelancer marketplace
Security engineers who are also developers, so we fix what we find
Testing only with written authorization and agreed scope
Confidential by default: we sign NDAs before accessing your code or accounts
Frequently asked questions
How do I stop bots on my website?
Use a WAF or CDN, add rate limits to sensitive endpoints, challenge suspicious traffic and lock your origin server to the CDN.
Will bot protection block real users?
Not if it's tuned. Rules run in log mode first, and challenges apply only to suspicious traffic.
Is Cloudflare enough to stop bots?
It's a strong start. Most apps also need rate limits in the application for account-specific abuse.
How do I stop fake sign-ups?
Rate limit sign-up and OTP by IP and phone, add a challenge such as Turnstile, and verify emails before granting value.
Can you help during an active attack?
Yes. Emergency edge setup can usually be done the same day.
Related problems
App got hacked: when credential stuffing leads to account takeover.
Product can't scale with growth: when traffic spikes slow everything down.
Cloud costs too high: when abuse inflates the bill.
Codersarts cybersecurity services: every security service in one place.