SVG XSS

WHAT IS SVG XSS?

SVG is an XML-based vector image format that supports scripts (JavaScript) and interactive elements. If an SVG file is not properly sanitized, attackers can inject malicious JavaScript that executes when the SVG is loaded in a web page.

HOW DOES SVG XSS WORK?

Injection: Attackers embed malicious JavaScript in an SVG file using <script>, event handlers (onload, onmouseover), or external script links. 

Delivery: The infected SVG is uploaded or shared on a vulnerable website.

Execution: When the victim loads the SVG, the script runs in their browser.

Impact: Can steal cookies, hijack sessions, or execute unauthorized actions.

 

MITIGATION FOR SVG XSS?

Sanitize SVGs: Use DOMPurify to remove scripts and unsafe attributes.

Use <img> Instead: Serve SVGs as images rather than inline elements.

Restrict Uploads: Validate and sanitize user-uploaded SVGs.

Apply CSP: Block inline scripts and restrict external script sources.

CONCLUSION:

SVG XSS is a serious security risk due to SVG’s ability to execute JavaScript. If not properly sanitized, attackers can inject malicious scripts that run in users’ browsers, leading to data theft or unauthorized actions. To prevent this, always sanitize SVG files, disable scripting, serve them as images when possible, and enforce security measures like Content Security Policy (CSP). Proper handling of SVGs ensures safer web applications and protects users from potential attacks.

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