cside
Client-side web security platform that watches scripts, users, and AI agents live in the browser session to stop script injection and fraud in real time.
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cside is a venture-backed browser-side threat detection and web security platform that monitors what scripts, users, and AI agents actually do as they execute in a live user session, rather than relying on static scans. It detects and blocks malicious first- and third-party scripts, script injections, account takeover attempts, and fraudulent users before the server even registers the event, closing a growing web-supply-chain blind spot as sites increasingly run dozens or hundreds of third-party scripts.
Founded in 2024 and headquartered in San Francisco, cside was named a Client-Side Protection winner in Cyber Defense Awards’ Top InfoSec Innovators, a top performer in SourceForge’s Client-Side Security category, and a CRN Stellar Startup in Security. As a young company, its recognition to date comes primarily from industry awards rather than large-scale, publicly disclosed enterprise deployments.
Innovation Matrix Assessment
Earned three separate industry-award recognitions within roughly a year of founding, indicating fast product maturation.
Real-time, live-session monitoring of third-party scripts closes a blind spot most WAF and CSP-based controls only address statically or after the fact.
Multiple award wins are a positive early signal, but as a 2024-founded company, funding scale and customer count remain limited and largely undisclosed. Recognized in Cyber Defense Media Group's 2026 Global InfoSec Awards (1 award), independently juried industry validation of market traction.
Live, behavioral client-side monitoring is a meaningfully different approach from static third-party-script scanning tools.
Award recognition is a positive signal, but independent, large-scale efficacy data against real payment-fraud or script-injection incidents was not found.
Third-party script and web-supply-chain attacks (Magecart-style skimming, AI agent abuse) are a growing and underserved threat category.
Why CISOs Should Care
Closes a real and growing blind spot -- what third-party scripts and AI agents actually do inside a live user session -- that most perimeter and CSP controls miss.
What Makes It Different
Live, behavioral session monitoring rather than periodic static scanning of third-party script inventories.
The Matrix Verdict
68/100 — INCREMENTAL INNOVATOR
A fast-moving, award-recognized young entrant in a genuinely underserved corner of application security, still early in proving scale.
Editorial Note: Claims vs. Verified Findings
Award wins are independently issued by the respective organizations; broader efficacy claims are vendor-published.
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