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A newly disclosed findings show that seemingly harmless in emails can be weaponized to steal login credentials, hijack authentication tokens, and manipulate AI-powered browsers, all while bypassing the sanitization filters webmail providers rely on to keep users safe. Webmail clients such as Gmail, Outlook, Fastmail, ProtonMail, Yahoo Mail, and AOL Mail must render untrusted HTML … Read more
Security researcher Gareth Heyes has revealed techniques for , the technologies used to format emails, to manipulate user interfaces, leak authentication data, and in some cases, capture passwords. Webmail services need to display HTML controlled by the sender without compromising the security of the mailbox application. To achieve this, providers sanitize the markup and restrict … Read more
A new class of email-based attacks that exploit ordinary CSS styling code to hijack webmail interfaces, spy on user activity, and even steal passwords in real time, all without relying on JavaScript or traditional malware. Dubbed “CSS bomb” attacks, the technique weaponizes trusted formatting features found in nearly every major webmail platform, turning a routine … Read more
Webmail CSS Attacks Expose a New Risk for AI-Powered Email Tools August 09, 2026 CSS attacks on major webmail services can steal credentials, hijack sessions and manipulate AI tools connected to users’ inboxes. PortSwigger researcher Gareth Heyes demonstrated something that should make every webmail team a little nervous: plain CSS, the styling language that’s supposed to … Read more
Swati KhandelwalAug 08, 2026Email Security / Vulnerability New research shows content inside an email can escape its message boundary and interfere with the webmail interface. Across attack chains spanning Outlook, Gmail, Fastmail, Proton Mail, Yahoo Mail, and AOL Mail, the techniques can capture passwords, take over third-party accounts, leak tokens, hijack trusted UI actions, and … Read more
Published: Thursday, 6 August 2026 at 22:00 UTC Updated: Thursday, 13 August 2026 at 09:21 UTC – – It’s quite common for webmail clients to render untrusted CSS in a trusted UI. They attempt to make this safe using CSS sanitization. In this paper I’m going to show you how to break out of trust … Read more
Key takeaways Full-stack developer interview questions may cover Python, HTML, CSS, and JavaScript, callback hell, continuous integration, DevOps, and the key skills for this role. Full-stack developer interview questions help the interviewer evaluate your coding knowledge, teamwork skills, ability to handle complex problems, and your process for improving software. You can prepare for a full-stack … Read more
It has been claimed many times that modern CSS is Turing complete – that is, it is a full programming language that you can use to do anything. Now we have more proof – a web page with nothing but CSS that runs x86 assembler. In principle, the web consists of HTML, CSS and JavaScript. … Read more
Front-end development in 2026 demands components that respond to their surroundings, not just the browser window. CSS container queries and subgrid, now fully supported across all major browsers (container queries: Chrome 105+, Firefox 110+, Safari 16+; subgrid: Chrome 117+, Firefox 71+, Safari 16+), make this achievable without a single line of JavaScript. Together, they enable … Read more