Improper Authentication in Mastodon - CVE-2024-25618
Published: February 14, 2024 / Updated: April 23, 2026
Vulnerability identifier: #VU126971
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2024-25618
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Mastodon
Mastodon
Software vendor:
Mastodon
Mastodon
Description
The vulnerability allows a remote user to take over another user's account.
The vulnerability exists due to improper authentication in external authentication account linking when matching first-time logins to existing local users by e-mail address. A remote user can change the e-mail address on an external identity provider account and log in through the provider to take over another user's account.
Exploitation requires the external authentication provider to allow e-mail address changes or multiple authentication providers to be configured.
Remediation
Install security update from vendor's website.