This cheat sheet demonstrates that input filtering is an incomplete defense for XSS by supplying testers with a series of XSS attacks that can bypass certain XSS defensive filters. Basic XSS Test Without Filter Evasion ¶

Sep 1, 2016 · Most WAFs when blocking XSS will block obvious tags like script and iframe, but they don't block img. Theoretically, you can img src='OFFSITE URL', but what's the worse that can happen? I know you...

Feb 7, 2018 · The XSS vulnerability is one of the most powerful vulnerabilities on the web, so never underestimate it and never forget that it can be exploited not just with a vulnerable URL, but also can be injected into content like images like we just saw.

Nov 14, 2024 · This cross-site scripting (XSS) cheat sheet contains many vectors that can help you bypass WAFs and filters. You can select vectors by the event, tag or browser and a proof of concept is included for every vector. You can download a PDF version of the XSS cheat sheet. This is a PortSwigger Research project. Follow us on Twitter to receive updates.

Mar 31, 2022 · Today I’m going to teach you how to test an image rendering application and be able to discover an XSS. Let’s get started, you need to have the URL of the application that allows image...

Jun 30, 2022 · We can use a hex-editor to inject javascript in the image metadata. This works because the browsers interpret the code when they render the image into HTML.

Feb 12, 2025 · XSS filter evasion techniques allow attackers to bypass cross-site scripting (XSS) protections designed to block malicious scripts. This article explores some of the most common filter bypass strategies, explains why relying solely on filtering is ineffective, and outlines the best practices for preventing XSS attacks.

Exploiting XSS with Javascript/JPEG Polyglot (by @medusa_0xf) - simplylu/jpeg_polyglot_xss

The Javascript is triggered if the image is served as text/html instead of image/jpeg. The vulnerability which the author discovered was that the application derives the content-type from the file extension instead of the intended media type.

When trying to exploit a XSS the first thing you need to know if where is your input being reflected. Depending on the context, you will be able to execute arbitrary JS code on different ways.