The content security policy (CSP) "sandbox" directive did not create a unique origin for the document, causing it to behave as if the "allow-same-origin" keyword were always specified. This could allow a Cross-Site Scripting (XSS) attack to be launched from unsafe content. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.
{
    "binaries": [
        {
            "binary_name": "firefox",
            "binary_version": "56.0+build6-0ubuntu0.14.04.1"
        },
        {
            "binary_name": "firefox-dev",
            "binary_version": "56.0+build6-0ubuntu0.14.04.1"
        },
        {
            "binary_name": "firefox-globalmenu",
            "binary_version": "56.0+build6-0ubuntu0.14.04.1"
        },
        {
            "binary_name": "firefox-mozsymbols",
            "binary_version": "56.0+build6-0ubuntu0.14.04.1"
        },
        {
            "binary_name": "firefox-testsuite",
            "binary_version": "56.0+build6-0ubuntu0.14.04.1"
        }
    ],
    "availability": "No subscription required"
}{
    "binaries": [
        {
            "binary_name": "thunderbird",
            "binary_version": "1:52.4.0+build1-0ubuntu0.14.04.2"
        },
        {
            "binary_name": "thunderbird-dev",
            "binary_version": "1:52.4.0+build1-0ubuntu0.14.04.2"
        },
        {
            "binary_name": "thunderbird-globalmenu",
            "binary_version": "1:52.4.0+build1-0ubuntu0.14.04.2"
        },
        {
            "binary_name": "thunderbird-gnome-support",
            "binary_version": "1:52.4.0+build1-0ubuntu0.14.04.2"
        },
        {
            "binary_name": "thunderbird-mozsymbols",
            "binary_version": "1:52.4.0+build1-0ubuntu0.14.04.2"
        },
        {
            "binary_name": "thunderbird-testsuite",
            "binary_version": "1:52.4.0+build1-0ubuntu0.14.04.2"
        },
        {
            "binary_name": "xul-ext-calendar-timezones",
            "binary_version": "1:52.4.0+build1-0ubuntu0.14.04.2"
        },
        {
            "binary_name": "xul-ext-gdata-provider",
            "binary_version": "1:52.4.0+build1-0ubuntu0.14.04.2"
        },
        {
            "binary_name": "xul-ext-lightning",
            "binary_version": "1:52.4.0+build1-0ubuntu0.14.04.2"
        }
    ],
    "availability": "No subscription required"
}{
    "binaries": [
        {
            "binary_name": "firefox",
            "binary_version": "56.0+build6-0ubuntu0.16.04.1"
        },
        {
            "binary_name": "firefox-dev",
            "binary_version": "56.0+build6-0ubuntu0.16.04.1"
        },
        {
            "binary_name": "firefox-globalmenu",
            "binary_version": "56.0+build6-0ubuntu0.16.04.1"
        },
        {
            "binary_name": "firefox-mozsymbols",
            "binary_version": "56.0+build6-0ubuntu0.16.04.1"
        },
        {
            "binary_name": "firefox-testsuite",
            "binary_version": "56.0+build6-0ubuntu0.16.04.1"
        }
    ],
    "availability": "No subscription required"
}{
    "binaries": [
        {
            "binary_name": "thunderbird",
            "binary_version": "1:52.4.0+build1-0ubuntu0.16.04.2"
        },
        {
            "binary_name": "thunderbird-dev",
            "binary_version": "1:52.4.0+build1-0ubuntu0.16.04.2"
        },
        {
            "binary_name": "thunderbird-globalmenu",
            "binary_version": "1:52.4.0+build1-0ubuntu0.16.04.2"
        },
        {
            "binary_name": "thunderbird-gnome-support",
            "binary_version": "1:52.4.0+build1-0ubuntu0.16.04.2"
        },
        {
            "binary_name": "thunderbird-mozsymbols",
            "binary_version": "1:52.4.0+build1-0ubuntu0.16.04.2"
        },
        {
            "binary_name": "thunderbird-testsuite",
            "binary_version": "1:52.4.0+build1-0ubuntu0.16.04.2"
        },
        {
            "binary_name": "xul-ext-calendar-timezones",
            "binary_version": "1:52.4.0+build1-0ubuntu0.16.04.2"
        },
        {
            "binary_name": "xul-ext-gdata-provider",
            "binary_version": "1:52.4.0+build1-0ubuntu0.16.04.2"
        },
        {
            "binary_name": "xul-ext-lightning",
            "binary_version": "1:52.4.0+build1-0ubuntu0.16.04.2"
        }
    ],
    "availability": "No subscription required"
}{
    "binaries": [
        {
            "binary_name": "firefox",
            "binary_version": "56.0+build6-0ubuntu1"
        },
        {
            "binary_name": "firefox-dev",
            "binary_version": "56.0+build6-0ubuntu1"
        },
        {
            "binary_name": "firefox-globalmenu",
            "binary_version": "56.0+build6-0ubuntu1"
        },
        {
            "binary_name": "firefox-mozsymbols",
            "binary_version": "56.0+build6-0ubuntu1"
        },
        {
            "binary_name": "firefox-testsuite",
            "binary_version": "56.0+build6-0ubuntu1"
        }
    ],
    "availability": "No subscription required"
}{
    "binaries": [
        {
            "binary_name": "thunderbird",
            "binary_version": "1:52.4.0+build1-0ubuntu2"
        },
        {
            "binary_name": "thunderbird-dev",
            "binary_version": "1:52.4.0+build1-0ubuntu2"
        },
        {
            "binary_name": "thunderbird-globalmenu",
            "binary_version": "1:52.4.0+build1-0ubuntu2"
        },
        {
            "binary_name": "thunderbird-gnome-support",
            "binary_version": "1:52.4.0+build1-0ubuntu2"
        },
        {
            "binary_name": "thunderbird-mozsymbols",
            "binary_version": "1:52.4.0+build1-0ubuntu2"
        },
        {
            "binary_name": "thunderbird-testsuite",
            "binary_version": "1:52.4.0+build1-0ubuntu2"
        },
        {
            "binary_name": "xul-ext-calendar-timezones",
            "binary_version": "1:52.4.0+build1-0ubuntu2"
        },
        {
            "binary_name": "xul-ext-gdata-provider",
            "binary_version": "1:52.4.0+build1-0ubuntu2"
        },
        {
            "binary_name": "xul-ext-lightning",
            "binary_version": "1:52.4.0+build1-0ubuntu2"
        }
    ],
    "availability": "No subscription required"
}