Use case
Block Script Injections
Stop script injections and client-side XSS by controlling all script execution at the browser level.
Stop script injections and client-side XSS by controlling all script execution at the browser level.
Any scripts on a webpage can gain access to Session Tokens stored in cookies, local storage, session storage, and other storage mechanisms. Attackers can exfiltrate authentication tokens to impersonate real users, bypassing MFA, and gain access to accounts.
Leads to data breaches, compliance violations (PCI DSS, GDPR, HIPAA), customer loss, and potential fines.
Malware, phishing UIs, or backdoors are delivered to real users on your own website, damaging trust and opening legal liability. Like the CoinMarketCap attack where fake wallet connection popups tricked users into connecting to malicious wallets. Read more about this topic
Client-side fetches happen between the user's browser and the server of the bad actor. Leaving no trace behind. Incidents go undetected for weeks or months without the data to investigate what happened.
Leading companies trust cside
Built for security teams who need visibility inside the browser, cside delivers proven defense against modern client-side attacks while supporting PCI DSS and GDPR compliance. Your trusted partner for securing the last mile of the web.
GDPR 
SOC 2 
PCI DSS FAQ
Frequently Asked Questions
Yes. cside is built to run safely in high-traffic, revenue-critical environments. We wrap scripts at runtime and monitor behavior. That means you can detect and block malicious activity without breaking legitimate functionality.
cside works across any web application or website. While many customers in eCommerce use us for PCI DSS and skimming protection, we also secure SaaS apps, fintech platforms, job boards, healthcare portals, and more. If your frontend handles sensitive data, this applies to you.
Yes. Cside detects and blocks DOM-based XSS and other client-side injections by analyzing script behavior in real time. We flag suspicious actions, even when obfuscated or injected via trusted scripts.
No. Cside usually makes pages faster. We cache static scripts to improve performance, route dynamic scripts faster than via normal BGP routing. However, fully optimized scripts can get 7ms slower, but in reality this represents a fraction of the scripts we see.