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Graph/cross-origin-windowopen-null

Pattern

Cross-Origin Window Open Null

cross-origin-windowopen-null

window.open fails (returns null or throws) when cross-origin security policies or sandbox/origin constraints are hit, such as COOP/noopener behavior, origin mismatches in postMessage, or indirect, non-user-initiated opens, breaking auth/connect flows and iframe handshakes.

Node Details

Public graph metadata

Updated7/27/2026

Connections

30 linked nodes

I'm trying to prevent it from redirecting to another page when I click to open a dialog. Tension: I want to prevent the page from redirecting when I intend to open the dialog. Outcome: The rendered content remains visually identical, but now the button is rendered outside the link and won't interfere with navigation.

"x-forwarded-host`header with value`foobar-3000.app.github.dev`does not match`origin`header with value`localhost:3000` from a forwarded Server Actions request. Aborting the action.". Tension: the problem is occurring elsewhere in the application. Outcome: Aborting the action.

Sentry reports a CORS error when the Vue 3 app running on http://localhost:3000 tries to send requests to the Sentry DSN, with the browser blocking the fetch due to a missing Access-Control-Allow-Origin header.

it fails — The code works locally but when I put it on an EC2 machine and change the CORS origins accordingly. Tension: I've checked the URL for 2 hours straight. Outcome: Still the same error below.

AADSTS9002325: Proof Key for Code Exchange is required for cross-origin authorization code redemption. Tension: redirects uris not matching.

intermittently logged `[REDACTED]` after fresh browser loads and route changes — A custom activity/chat overlay. Tension: The page checked the gateway browser client for an open WebSocket and then immediately sent RPCs such as session subscribe/list/history. Outcome: The client flag represented the raw socket state, not completion of the gateway's first-frame `connect` handshake.

Uncaught (in promise) SubmerchantAuthError: Popup is blocked by browser. — once i click it. Tension: the iFrame that contains the button to "Add Information" displays on the page, but once i click it. Outcome: Even so, a popup does open but shows just a loading indicator.

the redirect would be blocked by browser after successful payment — if I load the addin in a office web (microsoft 365) excel document in the browser. Tension: it is actually trying to navigate the top level window. Outcome: How can i achieve the behavior that the taskpane addin that is hosted inside should only be redirected?

chat room content flashes briefly before closing after navigation

Embedding a CPQ web app as an iframe inside Salesforce fails to persist authentication cookies/session for API calls. Login in a new tab isn’t recognized inside the Salesforce iframe, preventing authorized requests.

In an Electron renderer process, cross-origin fetches behave differently in development vs production, with no expected CORS preflight requests visible in production builds. The user also questions whether Electron enforces browser-style CORS and how `nodeIntegration` affects this behavior.

Is possible to call cl:open by another way? — I need to hide dungerous function(s), for example, cl:open for thirdparty code downloaded from internet. Outcome: There will be more.

Considerations for CORS (Cross-Origin Resource Sharing) should be taken into account with Option 1 — Option 1 utilizes an absolute URL (https://example.com/project_folder/user) for making AJAX calls. Tension: as it may lead to restrictions when making requests to a different domain. Outcome: Option 2 is often preferred within the same domain due to reduced risks of unintended requests to other domains.

callback request is not secure enough for production

REST API rejects browser client requests when Content Security Policy is not configured to allow the requesting site

When a page is served with Cross-Origin-Opener-Policy: same-origin inside a cross-origin iframe, calling window.open returns null in the parent page console, even though the popup tab opens successfully.

Chrome fails to start in Docker because the sandbox cannot create required namespaces

One of the online JavaScript scanners reported exactly that call being suspicious. Tension: I'm trying to understand what are security implications in a call like this in any modern Browser. Outcome: it will still work.

Browsers started logging a Content Security Policy (CSP) violation indicating that requests to https://vortex.data.microsoft.com/collect/v1 were refused because the page’s connect-src directive does not allow that endpoint.

xml2js versions <= 0.4.23 are vulnerable to prototype pollution, creating high-severity security issues in projects that depend on xml2js (directly or via aws-sdk).

on Chrome I get an error saying that the CSRF token is mismatched — show a third-party web page (with their approval) in an iframe. Tension: This site has a different domain to my parent site. Outcome: The site displays fine on firefox.

Fortify SCA reports that the following code is DOM XSS vulnerable — const returnUrl = sessionStorage.getItem('returnUrl') || '/'; window.location.href = returnUrl;. Outcome: Don't store a full URL, just store the necessary information.

SecurityError: Error #2121: Security sandbox violation: LoaderInfo.content: file:///C|/Users/Admin/Desktop/whatever.swf cannot access https://content.mspcdns.com/swf/headwear/story_2022_girlhat_tk.swf. — when I run my swf locally (also doesn't work with browser). Tension: I searched on the internet to fix the security problem with allow domain, but it is still not working. Outcome: I don't know what to do!

if I click refresh again, the page reloads immediately without showing the dialog — In Firefox, the browser back handling works, and the default dialog shows on refresh. Tension: This behavior does not happen in Chrome or Edge. Outcome: Firefox does not trigger the `beforeunload` event again after the first warning.

s a UI library’s dialog component. Tension: If I do that however, then the `onOpen` callback also gets called whenever the `onOpen` callback changes, which is not the behaviour that I want. Outcome: I want it only to be called when the `open` prop changes from `false` to `true`.

The postMessage communication between two iframes works on desktop browsers but fails to load/pass data on iOS and Android browsers. As a result, the iframe content never receives the message.

navigate does not reload the page when navigating to itself — opening up the exact same page via the same route. Tension: I need it to, because I'm dealing with dozens of fields and submodules that all need to be rebuilt and repopulated.

The window appears, but I can't interact with it and it disappears after a few seconds — I'm trying to get started with SFML (3.0.2) in C++,. Tension: something must be failing during its initialisation. Outcome: it's never reached so it must be failing during the execution of the Window constructor.

Wget before 1.21.1 forwards HTTP Authorization headers to different origins when following cross-origin redirects. — when following cross-origin redirects. Tension: An attacker-controlled server can respond with a 302 redirect to its own domain and capture the victim's credentials. Outcome: This is a critical information-leak vulnerability that affects users who authenticate to legitimate websites and are then redirected to attacker-controlled servers.

WebSocket connections to external services use Sandbox.WebSocket, not System.Net.WebSockets (sandboxed out) — In s&box. Tension: Developers need WebSockets for real-time external data (chat, live scores, IoT). The same URL restrictions as Http apply — no IP addresses, HTTPS/WSS only.

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