CyberRota Analysis
AI-GeneratedThe Stalwart Mail Server is vulnerable due to improper validation of OAuth redirect targets, allowing attackers to redirect authorization codes to their controlled destinations. This flaw can lead to unauthorized access to user accounts, enabling attackers to obtain access and refresh tokens and read sensitive email data. Organizations using Exchange should prioritize remediation to mitigate the risk of credential theft and unauthorized access to email communications.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Stalwart Mail Server does not compare an OAuth redirect target against any registered destination in its default configuration. The validation routine in crates/http/src/auth/oauth/registration.rs returns success immediately when the client-authentication requirement is disabled, and that requirement is false in the shipped settings, so the supplied redirect value is neither matched against a registered client nor otherwise constrained. The value is stored with the authorization code, and the login page reads it back and sends the browser to it with the code attached. A request naming a destination the attacker controls therefore delivers a valid authorization code there once the account holder authenticates, and because the token endpoint checks only that the redirect presented at exchange matches the one recorded with the code, the same party can exchange it for access and refresh tokens and read the account's mail.