New Firefox Warning—Emergency Update Fixes Two Exploited Flaws

Génération-NT

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Two critical vulnerabilities are corrected for the Firefox browser. They were exploited in a hacking contest and Mozilla reacts very quickly.

Linux-Magazin

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Two vulnerabilities have been discovered in Mozilla's Firefox browser, which may allow attackers to exploit malicious code. The vulnerabilities affect various editions of the browser. Firefox, Firefox for Android, and Firefox ESR are affected. Mozilla considers both security issues (CVE-2025-4918 and CVE-2025-4919) critical. With the browser updates, the issues are fixed. Firefox 138.0.4,

unsafe.sh

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The article explains the cause of error code 521 and its impact on website access, and provides possible solutions, such as checking server configuration, contacting the Internet service provider, or optimizing the website to deal with potential attacks.

zdnet.de

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They allow remote code execution. Both vulnerabilities are demonstrated in the Pwn2Own Berlin 2025 hack competition.