CVE-2023-42451

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CVSS 3.1

7.5 high

EPSS

<1%p45

Published

Sep 19, 2023 (Sep 19, 2023)

Modified

Jun 17, 2026

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.

Vendors: joinmastodon
Products: mastodon
Weakness: CWE-706
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

NVD CVE.org GitHub PoCs EPSS (0.6%)

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