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I am doing some background research into types of XSS and prevention and as I understand it there is not much any application can do against a universal XSS in a plugin or browser.
A last line of defense for XSS vulnerabilities is a good c… Continue reading Does an effective Content Security Policy mitigate a universal cross-site scripting vulnerability?
Payload:
<DIV STYLE="background-image: url(javascript:alert(‘XSS’))">
Reference: http://seguretat.wiki.uoc.edu/index.php/XSS_Cheat_Sheet
Can someone please explain why this payload is not working?
As you can see, all fields that I send only the attributes < > are coded, so they are not executing in the browser. Is there any way to bypass this XSS filter? In my case, only these attributes are encoded.
payload = <script>al… Continue reading Xss filter bypass ><script>alert(1);</script> [duplicate]
I have a web application where user can upload and view files. The user has a link next to the file (s)he has uploaded. Clicking on the link will open the file in the browser (if possible) or show the download dialog (of the browser). Mean… Continue reading Prevent Cross Site Scripting but still support HTML file upload
According to its official documentation, “twitter-server” is a Twitter OSS project used to provide a template from which servers at Twitter are built. It provides common application components such as an administrative HTTP server, tracing, stats, and … Continue reading CVE-2020-35774: twitter-server XSS Vulnerability Discovered
I want to create a minimal example where JavaScript injection/XSS is working. This is my example server:
const express = require("express");
const path = require("path");
const app = express();
const port = 3000;
I’m trying to mitigate postMessage exploitation like. information leakage, xss etc.. since I can’t solve this with origin (because origin might be problematic).
I might receive/send postMessage to different origins, sometimes it might be e… Continue reading How I can mitigate postMessage exploitation? [closed]
I’m trying to mitigate postMessage exploitation like. information leakage, xss etc.. since I can’t solve this with origin (because origin might be problematic).
I might receive/send postMessage to different origins, sometimes it might be e… Continue reading How I can mitigate postMessage exploitation? [closed]
When I do one of these payloads, I can see /etc/passwd:
<iframe src=file:///etc/passwd></iframe>
<img src="xasdasdasd" onerror="document.write(‘<iframe src=file:///etc/passwd></iframe>’)"/>… Continue reading How can I read local files from blind XSS?
I’ve been reading several articles recently about how storing JWTs in local or session storage is inherently insecure. The mitigation is apparently to implement a "session ID pattern", i.e. create a session ID, which is stored in… Continue reading Does OpenID Connect provide CSRF and XSS protection?