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Graph/csp-sandbox-runtime-blocks

AntiPattern

CSP/Web Sandbox Blocks Runtime

csp-sandbox-runtime-blocks

Security policy and browser sandboxing stop runtime code and network calls (CSP blocks script/telemetry, unsafe-eval is denied, same-origin opener rules isolate popups), causing features like WASM, telemetry, and script loading to fail unexpectedly.

Node Details

Public graph metadata

Updated7/25/2026

Connections

30 linked nodes

MATCHESSolution

Use a cleanup function to clear the timeout, or simulate latency with Chrome DevTools throttling or MSW delay instead

MATCHESSolution

Split challenge data into public metadata and private scoring data — The sandbox binds the target source repo into a temporary workspace and binds only the generated MCP config. Tension: the benchmark package path with a tmpfs mount. Outcome: Added a disable switch for environments that cannot run the sandbox.

MATCHESSolution

it seems that JS is not currently supported by the Sentry CMP library, and this is causing this issue — Compose Multiplatform (CMP) project that targets Android, iOS, and JS (browser) platforms. Tension: Use Sentry only for Android and iOS within the common code, Or somehow exclude/disable the Sentry integration when building the JS target. Outcome: we will offer no-ops for the JS target so you can compile without modifying anything.

MATCHESSolution

we recently enabled additional inbound filters for your JavaScript projects — error events from browser extensions, legacy browsers, and web crawlers. Tension: This change should help reduce error noise for you and your team. Outcome: If you prefer to see these errors, you can modify your inbound filters at any time.

MATCHESSolution

Ensure background.js is not imported into the content script; move shared variables/code into the content script (or a separate shared module) so background.js only runs in the service worker, and apply the Sentry.WINDOW.document workaround there.

MATCHESSolution

if using meta tag. Tension: The better solution for CSP is to put it into a header, but unfortunately a very large header causes issues with servers and clients. Outcome: So instead of setting some kind of report uri or configuring report to, you have a JS event listener `securitypolicyviolation`.

MATCHESSolution

Try the Sentry JavaSCript SDK and post an even through browser devtools console — then you can see the exact payload on the network tab. Tension: you can see the exact payload. Outcome: post an even through browser devtools console.

MATCHESSolution

These messages come from VivoBrowser or an Add-On for this Browser — Chrome Mobile WebView 87.0.4280 on Android. Tension: I suddenly started to get an error on my sentry logs for two particular errors. Outcome: which uses own injected JS-Code on web pages viewed.

MATCHESSolution

Use Safari DevTools console or browser console access to see the full failure details

MATCHESSolution

Either adjust your own CSP to allow the required Stripe/hCaptcha script execution (e.g., add the needed script sources/hashes/nonces), or contact/request CSP support from Stripe/the asset manager when you cannot control the hosted script’s CSP behavior.

MATCHESSolution

Run the student code in a restricted environment while the verification code runs in a separate un-restricted environment. Tension: there's no trust boundary between the student's function and the verification code. Outcome: Untrusted or unreliable code runs in a separate process with limited access.

MATCHESSolution

Use a real sandboxing mechanism (e.g., iframe sandboxing or other isolation) instead of relying on web components; optionally provide a reusable sandbox wrapper or enforce an API/store policy and accept risk via contracts/licensing when using user-provided components.

MATCHESSolution

Untrusted Javascript can be run safely in a typical web browser. — An alternative would be to require the untrusted code you want to run to be written in Javascript. Tension: neither web browsers or GraalVM are immune from security flaws. Outcome: A GraalVM application can run Javascript in a security sandbox.

MATCHESSolution

Use an automated website/script scanner such as OWASP ZAP with the pscanrulesBeta addon to detect polyfill.io script inclusion by scanning the site URLs (via a docker one-liner). Run it against the relevant deployed pages to catch dynamically loaded polyfills and occurrences from transitive dependencies.

MATCHESSolution

Configure CSP via Next.js middleware (not `vercel.json`) and include the correct nonce-based `script-src` (letting Next.js automatically inject nonces into `_next` script tags). Ensure the root `app/layout.tsx` is set to `dynamic` so a fresh nonce is produced on each request.

MATCHESSolution

Adjust/remedy the COOP configuration so the iframe/popup context does not enter the 'new with no opener' rule (e.g., relax COOP or ensure same-origin/top-level origin alignment), so window.open will return a window reference instead of null.

MATCHESSolution

unless its predecessor specified the same cross-origin opener policy and they are same origin. — same-origin-allow-popups. Outcome: This forces the creation of a new top-level browsing context for the document.

MATCHESSolution

new Function(userCode); — verify (client-side) that the user has entered valid JavaScript code. Tension: Pulling in a Javascript parser (e.g. Acorn or Esprima) is a relatively heavy dependency. Outcome: Parsing/compiling JS code is safe and has no side effects.

MATCHESSolution

Update the CSP to permit the required Microsoft telemetry endpoint in connect-src (e.g., add https://vortex.data.microsoft.com) or avoid applying the restrictive CSP to pages where telemetry is expected (scoping/splitting CSP per page/response).

MATCHESSolution

I've tried many solutions - webpack magic comments, JS eval — The dynamic loading was the only change. Outcome: it worked in a way that bundle is no 700kB instead of 6mb.

MATCHESSolution

Use the correct iframe load lifecycle event (e.g., `loadedmetadata`/appropriate ready event) before calling `contentWindow.postMessage`. Fix the origin check by using the correct/static expected parent URL (or validate/log `event.origin` before returning) so messages aren’t discarded.

MATCHESSolution

Treat Google Apps Script Web Apps as having quirky, undocumented front-end limitations related to iframe/HTML behavior; follow the official HTML Service best practices/restrictions and adjust the deployment approach (or move away from GAS Web Apps for the UI) until the layout stabilizes.

MATCHESSolution

add a conditional breakpoint on a few jdk classes that can create tmp files — If you are capable of a debugging session. Tension: you need to edit the webserver launcher script. Outcome: instrument those call sites; write a pure java agent to load on the java.exe command line.

MATCHESSolution

Use Sandbox.WebSocket for real-time external connections — In s&box.

MATCHESSolution

Implemented Content-Security-Policy, X-Frame-Options, CSRF tokens, and rate limiting middleware — for Tor hidden services. Outcome: Implemented Content-Security-Policy, X-Frame-Options, CSRF tokens, and rate limiting middleware for Tor hidden services.

MATCHESSolution

Facepunch Sandbox demonstrates a clean dual-scope event architecture using `Local` and `Global` static classes. Tension: Difficulty implementing cancellable events.

MATCHESSolution

Facepunch Sandbox implements a GameObjectSystem-based ban system with INetworkListener. — Load from LocalData on startup. Tension: INetworkListener - blocks at connection time. Outcome: Reject con.

MATCHESSolution

Kept the protocol mismatch as a classified close cause — Added [REDACTED] and scoped device-auth invalidation for auth-state migrations, but did not clear unrelated browser storage. Tension: The real remediation for the observed loop is closing or hard-refreshing the stale tab so it loads the current SPA bundle. Outcome: Browser harness evidence classified the failure as protocol mismatch with high confidence, while fresh navigation connected normally.

MATCHESSolution

CSP-blocked localhost diagnostics — custom activity script. Tension: custom diagnostics fetched a localhost endpoint blocked by CSP. Outcome: Removed forbidden localhost diagnostic fetches from the custom activity script.

MATCHESSolution

Three techniques applied together: — any enforcement module (DOM assertion, CSP checker, sanitizer) that must reference the same patterns its surrounding CI gate scans for. Tension: split the forbidden literal at any point that breaks the contiguous match without altering the runtime string value.

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