smart-sso through 2.1.1 OAuth2 Authorization Code Theft via Unvalidated redirectUri

Advisories

smart-sso through 2.1.1 OAuth2 Authorization Code Theft via Unvalidated redirectUri

Severity: high
Date: 10/16/2026
Affecting: smart-sso <= 2.1.1
CVE: CVE-2026-111622
CWE: CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
CVSS: 7.6
CVSS V4 Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
References: https://hackmd.io/@hieuPenguinnn/smart-sso-oauth2-code-leak-open-redirect
https://github.com/a466350665/smart-sso/blob/2.1.1/smart-sso-server/src/main/java/com/smart/sso/server/controller/LoginController.java#L53-L63
https://github.com/a466350665/smart-sso/blob/1.6.0/smart-sso-server/src/main/java/openjoe/smart/sso/server/controller/LoginController.java#L50-L59
https://github.com/a466350665/smart-sso/blob/1.6.0/smart-sso-server/src/main/java/openjoe/smart/sso/server/controller/Oauth2Controller.java#L55-L84
https://github.com/a466350665/smart-sso
Credit: hieuPenguinnn
Description: smart-sso through 2.1.1 contains an open redirect vulnerability in the /login handler that allows unauthenticated attackers to steal OAuth2 authorization codes by supplying an unvalidated redirectUri parameter. Attackers can send crafted /login links to users with active SSO sessions, then redeem stolen codes at /oauth2/access_token with any valid client credentials to obtain victims' access tokens.

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