A recent bug bounty case study reveals a sophisticated attack chain where a single, improperly sanitized SVG image file became the linchpin for Account Takeover (ATO). The vulnerability, a Stored Cross-Site Scripting (XSS) flaw, allowed malicious JavaScript to persist on a target platform and execute automatically whenever the image was viewed, demonstrating how seemingly low-severity issues can escalate into critical security breaches.
Learning Objectives:
Understand the mechanics of Stored XSS via SVG files and how it differs from Reflected XSS.
Learn the step-by-step exploitation path from injecting malicious SVG to achieving full Account Takeover (ATO).
Master defensive coding practices and configuration changes to prevent similar vulnerabilities in web applications.
1. The Anatomy of an SVG XSS Payload
SVG (Scalable Vector Graphics) files are XML-based. Unlike standard image formats, they can contain embedded JavaScript within `
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