At the time of its discovery, the dangerous vulnerability had already been exploited. Mozilla was forced to release an emergency fix for all versions of the Firefox browser. This was reported by UNN with reference to Europa Press and Mozilla.
The critical vulnerability works in a similar pattern to the problem in Chrome.
Mozilla developers discovered a dangerous vulnerability in the Firefox browser, which was designated as CVE-2025-2857. As stated, it affects standard and ESR versions of Firefox.
The problem is part of a series of attacks targeting browser isolation mechanisms. This flaw is similar to a vulnerability that recently affected Chrome, the company explains.
Important: Mozilla classifies the risk as "critical," which corresponds to the highest level of danger. An attacker can gain access to data on other parts of the computer.
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Currently, it is known that the flaw only affects Windows users, and according to the developers, Mac and Linux users are not at risk. The secure Tor browser, based on Firefox, is also "susceptible to the vulnerability."
The company confirmed that developers reacted quickly, releasing fixes for Firefox 136.0.4 and ESR versions 115.21.1 and 128.8.1.
Update your browser right now!
Firefox users should update to the new versions 136.0.4, Firefox ESR 115.21.1, or Firefox ESR 128.8.1 as soon as possible. Usually, the update happens automatically.
In addition, you can actively download it via the "Help" > "About Firefox" menu. After installation, the browser must be restarted.
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