01
Discover the behavior.
Review detected scripts, providers, capability use, and connections before setting a boundary.
Give Every Script a Boundary.
Turn third-party JavaScript from implicit trust into explicit policy. Define what can run, which browser capabilities it can use, and where it can send data—then investigate violations with the context to act.
THE LEAST-PRIVILEGE APPROACH
Move from presence to permission.
Inventory tells you what is present. Policy determines what each resource is allowed to do.
02
Define the boundary.
Choose allow, block, or inherit and grant only the browser and network access the resource needs.
03
Investigate the exception.
Connect out-of-policy activity to issue context, alert history, and a traceable review lifecycle.
POLICY INHERITANCE
Start broad. Override with intent.
Use a global baseline as the foundation, model provider-level expectations, and reserve resource overrides for specific exceptions. Inherit keeps policy relationships understandable as your inventory grows.
BROWSER CAPABILITIES
Control the capability surface.
Configure access around the behaviors that matter instead of treating every approved script as equally trusted.
01
Data access
Set boundaries around browser-held and page-level data.
cookies / storage · clipboard · DOM and content reads
02
Execution
Control script execution and higher-risk dynamic functionality.
script execution · dynamic APIs · WebAssembly
03
User & device
Configure access to permission-sensitive device features.
geolocation · camera / microphone class · notifications
04
Observation & profiling
Limit signals that can expand tracking or fingerprinting scope.
canvas · navigator signals · event listeners
NETWORK BOUNDARIES
Decide where scripts may connect.
Keep open connectivity where it is appropriate, or restrict fetch and XHR traffic to approved URL patterns. Rejected requests retain the resource and event context needed for review.
Allow-all mode
Observe connectivity while establishing the expected baseline.
Restricted mode
Permit approved URL patterns and reject out-of-policy requests.
FROM VIOLATION TO INVESTIGATION
A decision is only useful when the context follows.
Connect a blocked action to its resource, severity, evidence, alert history, and human review state.
01
Resource context
See the affected script, page, provider, severity, discovery time, and current status together, so reviewers can identify exactly where the policy violation originated.
02
Decision context
Understand which policy boundary was crossed, how the behavior affects the business, and which recommended next action gives the reviewer the safest path forward.
03
Technical evidence
Review session telemetry, request details, capability usage, supporting references, and raw event data without leaving the investigation or reconstructing the incident manually.
04
Human lifecycle
Keep ownership and review history attached as the finding moves from open to acknowledged, remediated, or closed, with every human decision preserved for later audits.
Issue views can bring together business impact, recommended action, technical and session detail, raw evidence, and status. Threshold alert policies add a review signal without implying an automatic fix.
LIVE POLICY DECISIONS
Allowed behavior passes. Everything else becomes visible.
CellWall evaluates script activity against the boundary you define, allowing expected behavior while surfacing or blocking out-of-policy access.
Capability guardrails
Allow the page reads a resource needs while stopping a disallowed capability at a clear boundary.
Network boundaries
Keep approved connections moving and attach resource context when a destination falls outside policy.
ONE BOUNDARY, SHARED CONTEXT
Useful across the teams that ship the frontend.
Give each owner a practical way to reason about third-party behavior without promising that strict policy is risk-free.
01
Security
Standardize least-privilege defaults and reduce unnecessary exposure to sensitive browser capabilities.
02
Product
Preserve approved vendor behavior while limiting each integration to its intended scope.
03
Marketing
Introduce pixels and tools with explicit boundaries, observable behavior, and a review path when they change.
CONTROL COVERAGE
Define, observe, and respond in one model.
A compact view of where policy configuration and investigation context meet.
| Global baseline | Available | Contextual | Contextual |
| Provider policy | Available | Contextual | Contextual |
| Resource override | Available | Available | Contextual |
| Allow / block / inherit | Available | Available | Available |
| Browser capabilities | Available | Available | Available |
| Network URL patterns | Available | Available | Available |
| Region setting | Available | Contextual | Contextual |
| Issue investigation | Contextual | Available | Available |
| Threshold alerts | Available | Available | Available |
| Lifecycle status | Contextual | Available | Available |
POLICY ENFORCEMENT FAQ
Practical answers before you enforce.
How to introduce browser-side boundaries without confusing policy with a one-time configuration.
What is client-side policy enforcement?
It is the practice of defining and applying explicit boundaries to scripts running in the browser, including whether they may run, use selected capabilities, or make particular outbound requests.
How is this different from CSP?
Content Security Policy is a browser standard delivered through response headers or markup. CellWall's runtime policy controls focus on script behavior, capability access, and request context. They can complement CSP, but they do not replace or automatically manage it.
Can I start in an allow-first mode?
Yes. Begin by observing expected behavior and building a baseline, then test targeted restrictions before moving selected resources to stricter policies.
What happens when a vendor changes behavior?
Behavior outside the configured boundary can be surfaced or blocked with resource context, allowing the team to review the change and decide whether policy should be updated.
Can policy be scoped to one script?
The product model supports resource-specific allow, block, or inherit settings, so a specific resource can carry an explicit exception to broader defaults.
Which browser capabilities can be controlled?
Configurable categories include storage and cookies, clipboard, DOM and content access, execution APIs, WebAssembly, device features, notifications, canvas, profile signals, and event listeners. Coverage depends on the relevant intercepted browser behavior.
How do network restrictions work?
A resource can use an open network mode or a restricted list of approved URL patterns. Out-of-policy fetch or XHR requests can be rejected and recorded with event context.
Will strict policies break third-party tools?
A boundary that excludes required behavior can affect functionality. Observe first, establish a baseline, test in the target environment, and tighten policy gradually.
How do issues and alerts fit the enforcement workflow?
Issues organize severity, status, resource, impact, recommendations, and technical evidence. Threshold alert policies add history and notification context, while acknowledgement or closure remains a human review action.
LEAST-PRIVILEGE FRONTEND
Replace implicit trust with explicit policy.
See how browser capability and network boundaries can turn third-party behavior into a reviewable control.
Policy enforcement should be tested in the target environment and used as one layer in a defense-in-depth program.