title: Mastodon Invalid Domain Name Normalization vulnerability
description: Mastodon is a free, open-source social network server based on ActivityPub. Prior to versions 3.5.14, 4.0.10, 4.1.8, and 4.2.0-rc2, under certain circumstances, attackers can exploit a flaw in domain name normalization to spoof domains they do not own. Versions 3.5.14, 4.0.10, 4.1.8, and 4.2.0-rc2 contain a patch for this issue.
problem types: CWE-706: Use of Incorrectly-Resolved Name or Reference
affected:
{
vendor: mastodon
product: mastodon
versions:
version: < 3.5.14, status: affected
version: >= 4.0.0, < 4.0.10, status: affected
version: >= 4.1.0, < 4.1.8, status: affected
version: >= 4.2.0-beta1, < 4.2.0-rc2, status: affected
}
metrics:
cvssV3_1: [
attackComplexity: HIGH
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 7.4
baseSeverity: HIGH
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
version: 3.1
]