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Graph/cross-origin-popup-opener-null

Pattern

Cross-Origin Popup Behavior

cross-origin-popup-opener-null

Cross-origin opener and browser policies (e.g., COOP/noopener) cause window.open and opener references to resolve to null or new browsing contexts, so the site unexpectedly loses access to popups or flags behavior as insecure.

Node Details

Public graph metadata

Updated8/7/2026

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.

Using `useRef` inside a hook that needs a reference for a DOM node that may not exist or change during the component's render — popups, dialogs, etc. Tension: may cause stale references or missed updates. Outcome: keeping the state consistent with the latest DOM element.

were not accessible in js and in browser — Cookies are being set and sent with the next request. Outcome: The problem solved by adding `domain="blueberry.adefe.xyz"` to the cookie in response.

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.

traditional browser fingerprinting methods aren't revealing any unusual characteristics or anomalies. Tension: CDP-controlled browsers mimic regular user browsers closely. Outcome: no general answer which applies long-term to this question.

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

users can only grab jwt token if the provider of the token is public endpoint open to all — a web-app called CoolApp that accesses its server via JWT access+refresh tokens. Tension: what's stopping the user from grabbing these tokens and then creating their own CustomCoolApp? Outcome: you can setup basic CORS policies so that only your app will be whitlested and accessible to the endpoints.

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.

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.

it adds one div with an anchor tag to an external. Tension: another tab is opened to redirect to the third party site. Outcome: I had the same problem but had founded it in my hacked jquery file.

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.

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.

After upgrading Struts to 6.1.x, requests fail because the browser blocks loading required script resources (e.g., jQuery) due to a violated Content-Security-Policy directive for script-src.

if it is populating the `href` attribute of an `` tag, then pseudo attacks can still occur. Tension: Are there still ways to perform xss attacks that are not covered? Outcome: pseudo attacks can still occur.

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.

Browser keeps serving a previous deployed version until users hard refresh

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.

Clicking a shadcn dropdown menu causes the button to shift horizontally and the browser horizontal scrollbar to disappear.

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.

nothing is displayed on the pop-up window — When I click on the "sign up with google button".

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.

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