CVE-2024-25618
CVSS 3.1 Score 4.2 of 10 (medium)
Details
Summary
CVE-2024-25618 is a medium severity vulnerability affecting Mastodon, an open-source social network server based on ActivityPub. The issue lies in Mastodon's handling of new identities from external authentication providers such as CAS, SAML, and OIDC. When a user logs in through an external provider for the first time, Mastodon checks the email address to find an existing account. However, if the authentication provider allows changing the email address, an attacker can hijack the Mastodon account, putting all users logging in through external providers at risk. Microsoft Azure and other dynamic client registration OIDC providers are known to make it easy to accidentally allow unverified email changes, increasing the potential for this vulnerability to be exploited. Users are advised to upgrade to versions 4.2.6, 4.1.14, 4.0.14, or 3.5.18 to address the issue, and there are no known workarounds.
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