CyberNews.work has learned that a new class of attacks is targeting webmail defenses, allowing hackers to break through and steal sensitive credentials. The CSS-based attacks exploit vulnerabilities in how websites handle JavaScript code, giving malicious actors a way into otherwise secure systems. This breach can lead to the theft of not only passwords but also tokens used for two-factor authentication.
The affected parties include individuals who use web-based email services such as Gmail or Outlook, as well as organizations that rely on these platforms for communication and collaboration. The attack works by manipulating CSS (Cascading Style Sheets) code embedded in a website to inject malicious JavaScript into the user’s browser. This injected code is then used to bypass security measures and gain unauthorized access to sensitive data.
At its core, this type of attack relies on the way web browsers handle cross-origin resource sharing (CORS). CORS allows websites to request resources from other domains, but it also creates a vulnerability when malicious actors can manipulate these requests. By exploiting this weakness, hackers can break through the usual defenses and access secure areas of a website.
The severity of this issue is underscored by its potential for widespread impact. Webmail services are used by millions worldwide, making them an attractive target for attackers seeking to compromise sensitive information. Furthermore, as more organizations move their operations online, the risks associated with web-based attacks continue to escalate.
While these attacks are complex and require a certain level of technical expertise to execute, they can be mitigated through simple measures such as keeping software up-to-date and using reputable security tools. It’s also essential for users to remain vigilant when clicking on links or downloading attachments from unknown sources. By being aware of the potential risks associated with web-based attacks, individuals can take proactive steps to protect themselves and their organizations.
In light of this new threat, CyberNews.work advises readers to regularly review and update their security settings, particularly those related to CORS and JavaScript handling. Additionally, staying informed about emerging threats is crucial in today’s fast-paced cybersecurity landscape.
Source: The Hacker News — 2026-08-08