CVE-2026-81036
HighCVSS 8.1Exploitation Probability (EPSS)
Low risk23th percentile - higher than 23% of all known CVEs
Summary
Stalwart Mail Server does not compare an OAuth redirect target against any registered destination in its default configuration. The validation routine returns success immediately when client-authentication is disabled, which is the case in shipped settings. The redirect value is stored with the authorization code, and the login page sends the browser to it with the code, allowing an attacker to capture the code and exchange it for tokens to read the victim's mail.
Risk Assessment
An attacker can take over a user's account and read their email, leading to confidentiality breaches and potential further attacks.
Recommendation
Update Stalwart Mail Server to a version that requires redirect target validation by default. If possible, enable client authentication and configure allowed redirect destinations.
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Original NVD description (English source)
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.