WordPress before 5.2.4 is vulnerable to poisoning of the cache of JSON GET requests because certain requests lack a Vary: Origin header.
{
"binaries": [
{
"binary_version": "4.4.2+dfsg-1ubuntu1",
"binary_name": "wordpress"
},
{
"binary_version": "4.4.2+dfsg-1ubuntu1",
"binary_name": "wordpress-l10n"
},
{
"binary_version": "4.4.2+dfsg-1ubuntu1",
"binary_name": "wordpress-theme-twentyfifteen"
},
{
"binary_version": "4.4.2+dfsg-1ubuntu1",
"binary_name": "wordpress-theme-twentyfourteen"
},
{
"binary_version": "4.4.2+dfsg-1ubuntu1",
"binary_name": "wordpress-theme-twentysixteen"
}
]
}
{
"binaries": [
{
"binary_version": "4.9.5+dfsg1-1",
"binary_name": "wordpress"
},
{
"binary_version": "4.9.5+dfsg1-1",
"binary_name": "wordpress-l10n"
},
{
"binary_version": "4.9.5+dfsg1-1",
"binary_name": "wordpress-theme-twentyfifteen"
},
{
"binary_version": "4.9.5+dfsg1-1",
"binary_name": "wordpress-theme-twentyseventeen"
},
{
"binary_version": "4.9.5+dfsg1-1",
"binary_name": "wordpress-theme-twentysixteen"
}
]
}