XSS Vulnerabilities Persist in Webmail Applications
/ 1 min read
🧩 Webmail applications remain vulnerable to XSS attacks despite security measures. The complexity of HTML in emails poses significant security challenges, often leading to cross-site scripting (XSS) vulnerabilities. Common protective strategies, such as iframe sandboxes and HTML sanitizers, are not foolproof, as evidenced by a recent vulnerability in Protonmail. Attackers frequently probe for these weaknesses, as demonstrated by a series of XSS attack attempts targeting an ISC email address, reportedly originating from an insecure WordPress webmail implementation. The attacks utilized a service called xss.report to collect browser data, highlighting the ongoing risks associated with HTML content in emails. Users are advised to block access to xss.report and monitor for any related activity.
