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Since you will be putting code inside your page as an iframe there is no security issue for you.<br />
Iframes are just pages inside pages. Moreover since you are saying that the iframe is coming from another domain you don;t need to worry for potential javascript xss/injection attack that ma occur, since an acces denied woudl arise if a js call from one element to the iframe element happened.<br />
The only think you should worry is if they decide one day that they don't allow to you to put their aspx page in your iframe, they could prohibit that since the would see traffic coming from your site and block this traffic
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Since you will be putting code inside your page as an iframe there is no security issue for you.
Iframes are just pages inside pages. Moreover since you are saying that the iframe is coming from another domain you don;t need to worry for potential javascript xss/injection attack that ma occur, since an acces denied woudl arise if a js call from one element to the iframe element happened.
The only think you should worry is if they decide one day that they don't allow to you to put their aspx page in your iframe, they could prohibit that since the would see traffic coming from your site and block this traffic

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so if they intentionally include any js or mysql queries in their aspx file to read my database, wont this be possible as cross-site scripting?
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so if they intentionally include any js or mysql queries in their aspx file to read my database, wont this be possible as cross-site scripting?

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I need to use &lt;iframe&gt; to include an output of an aspx page from other domain into one of my php pages in my domain. &nbsp;Is there any known security issues when doing this? &nbsp;Or can the other domain webmasters do any workaround to hack into my server using the aspx page I'm iframing?<br />
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I need to use <iframe> to include an output of an aspx page from other domain into one of my php pages in my domain.  Is there any known security issues when doing this?  Or can the other domain webmasters do any workaround to hack into my server using the aspx page I'm iframing?



Is there any IFRAME security issues?

A vulnerability is a weakness which allows an attacker to reduce a system's information assurance. Vulnerability is the intersection of three elements: a system susceptibility or flaw, attacker access to the flaw, and attacker capability to exploit the flaw. To exploit a vulnerability, an attacker must have at least one applicable tool or technique that can connect to a system weakness, known as the attack surface. Vulnerability management is the cyclical practice of identifying, classifying, remediating, and mitigating vulnerabilities. Other vulnerabilities include security risks, security defects and constructs in programming languages that are difficult to use properly.

Vulnerabilities

Web browsers are applications used primarily to display documents, files and media from the Internet, identified by a Uniform Resource Identifier (URI) that can be a page, image, video or other file. Some browsers require the use of add-ons or extensions to safely render the information they receive; others have systems built into them to perform the same functions.

Web Browsers

Web applications are systems that run in browsers that perform functions normally associated with other client-based programs. One of the most commonly used web applications is email; instead of downloading individual emails to a local machine, the data is shown through a website. Other examples of web applications are collaborative systems like a wiki or an online game.