Set-Cookie response headers were being incorrectly honored in multipart HTTP responses. If an attacker could control the Content-Type response header, as well as control part of the response body, they could inject Set-Cookie response headers that would have been honored by the browser. This vulnerability affects Firefox < 123, Firefox ESR < 115.8, and Thunderbird < 115.8.
{
"availability": "No subscription required",
"binaries": [
{
"binary_name": "firefox",
"binary_version": "123.0+build3-0ubuntu0.20.04.1"
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"availability": "No subscription required",
"binaries": [
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"availability": "No subscription required",
"binaries": [
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"binary_name": "thunderbird",
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