This vulnerability impacts any Rails applications using rails_multisite alongside Rails' signed/encrypted cookies. Depending on how the application makes use of these cookies, it may be possible for an attacker to re-use cookies on different 'sites' within a multi-site Rails application.
The issue has been patched in v4 of the rails_multisite gem. Note that this upgrade will invalidate all previous signed/encrypted cookies. The impact of this invalidation will vary based on the application architecture.
{
"github_reviewed": true,
"github_reviewed_at": "2021-11-15T17:53:35Z",
"nvd_published_at": "2021-11-15T20:15:00Z",
"severity": "MODERATE",
"cwe_ids": [
"CWE-200",
"CWE-327",
"CWE-565"
]
}