Critical Opera GX Vulnerability Lets Attackers Inject CSS Across Every Webpage

A critical security vulnerability in Opera GX has been disclosed, revealing that attackers could exploit the browser’s GX Mods feature to inject malicious CSS across every webpage visited by a victim. This could enable cross-site data exfiltration and have a widespread impact on the browser. The research, published by zhero_web_security in 2026, demonstrates a zero-click […]

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