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A nested iframe, triggering a cross-site navigation, could send SameSite=Strict or Lax cookies. This vulnerability affects Firefox < 128 and Thunderbird < 128.

🗓️ 03 Sep 2025 22:10:27Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 2 Views

Nested iframe leaks SameSite cookies via cross-site navigation in Firefox and Thunderbird below 128.

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03 Sep 2025 22:10Current
9.2High risk
Vulners AI Score9.2
CVSS 3.19.8
EPSS0.00662
SSVC
2