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When Firefox is configured to block storage of all cookies, it was still possible to store data in localstorage by using an iframe with a source of 'about:blank'. This could have led to malicious websites storing tracking data without permission. This vulnerability affects Firefox < 115.

🗓️ 03 Sep 2025 23:08:41Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 1 Views

Firefox with cookies blocked still allows localStorage via an about:blank iframe, risking tracking data; affects Firefox before 115.

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03 Sep 2025 23:08Current
7High risk
Vulners AI Score7
CVSS 3.16.5
EPSS0.00203
SSVC
1