Enhanced Tracking Protection's Strict mode may have inadvertently allowed a CSP frame-src bypass and DOM-based XSS through the Google SafeFrame shim in the Web Compatibility extension. This issue could have exposed users to malicious frames masquerading as legitimate content. This vulnerability affects Firefox < 133, Firefox ESR < 128.5, Firefox ESR < 115.18, Thunderbird < 133, Thunderbird < 128.5, and Thunderbird < 115.18.
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"availability": "No subscription required",
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"binary_version": "133.0+build2-0ubuntu0.20.04.1",
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"availability": "No subscription required",
"binaries": [
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"binary_version": "1:115.18.0+build1-0ubuntu0.20.04.1",
"binary_name": "thunderbird"
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"binary_name": "xul-ext-calendar-timezones"
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"availability": "No subscription required",
"binaries": [
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"binary_version": "1:115.18.0+build1-0ubuntu0.22.04.1",
"binary_name": "thunderbird"
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