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It was possible to move the cursor using pointerlock from an iframe. This allowed moving the cursor outside of the viewport and the Firefox window. This vulnerability affects Firefox < 128 and Thunderbird < 128.

🗓️ 03 Sep 2025 23:24:05Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 2 Views

Pointer lock in an iframe allows moving the cursor outside the viewport; affects Firefox and Thunderbird before 128.

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03 Sep 2025 23:24Current
9.2High risk
Vulners AI Score9.2
CVSS 3.14.3
EPSS0.00377
SSVC
2