Collaborate Disseminate
MDN says that attempting to use Access-control-allow-origin: * with credentials should result in an error.
Taking this into account, why so many major companies’ APIs (spotify, twilio, among many others) return both Access-… Continue reading What’s the reason of both "Allow-Origin: *" and "Allow-Credentials: true" headers?
I’m currently researching a possible security vulnerability I may have found on a well-known website. Before I present to the company, I’d like to build a proof of concept.
I’m looking at a site (Site A) that has a form. The… Continue reading Scraping data from a form submission on another domain
My wife’s machine could not load any Instagram content through JavaScript because of the following error:
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://graph.instagram…. Continue reading CORS requests for Instagram fail without VPN
I am working in React, and I have an image which has an src attribute of https://s3.amazonaws.com/sample_endpoint. My website domain is https://sample-website.com.
I am using a library, dom-to-image, https://www.npmjs.com/pa… Continue reading Does changing an image src attribute to call a PHP function on my server to retrieve an image from another server eliminate CORS policy issues?
In case of an open API, the only possible value for Access-Control-Allow-Origin is a wildcard (*), since you can’t have a list of allowed domains.
Still, this seems not to bug developpers and appears to keep the system secur… Continue reading Why CORS is still securing an open api where all requests have a wildcard (*)?
CSS, JS, images etc are all fetched as no-cors. What’s different about web fonts?
Per the spec:
For font loads, user agents must use the potentially CORS-enabled fetch method defined by the [FETCH] specification for URL’… Continue reading Why are web font resource requests not no-cors?
about attacks like this where the do change the router dns using malicious code on fake sites or ads … how these sites were allowed to access the router while routers doesn’t have
Access-Control-Allow-Origin response head… Continue reading how did hackers do the CSRF router hacking while CORS policy exist?
I am running a website that contains data that our users can access if they login.
Someone else has created an Android app that lets users access that data as well. They enter their credentials, and the app then connects to … Continue reading How to stop app from fetching data from my website?
I’m looking at the following setup. A web application uses a REST API to communicate with the server. All API responses include Origin: *. For authorization Authorization: Bearer <token> is used. Access-Control-Allow-He… Continue reading Exploitability of allowed wildcard (*) CORS Origins with Bearer Token Authorization
Here the response afterchanging the Origin via Burp
HTTP/1.1 200 OK
Server: nginx
Date: Thu, 13 Jun 2019 12:29:07 GMT
Content-Type: application/json;charset=UTF-8
Connection: close
Vary: Accept-Encoding
Access-Control-Allow-… Continue reading CORS issue detected by Burp, but test code poc doesn’t work