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Escaping the sandbox is one of the browsers primary security defenses, reportsCyberInsider.

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By escaping the sandbox, cybercriminals could havemalwarerun on the target computer through the web app.

Mozilla also added that the bug affects Firefox on Windows, and that otheroperating systemsare unaffected.

Chromes original vulnerability is tracked as CVE-2025-2783, while the Firefox one is being tracked as CVE-2025-2857.

No severity score has yet been assigned.

NorGoogle, nor Mozilla, discussed the threat actors or the victims.

The campaign involved phishing, redirecting victims to primakovreadings[dot]info.

The entire campaign was dubbed Operation ForumTroll and apparently, the goal is to conduct cyber-espionage.