CVE-2026-111622
smart-sso through 2.1.1 OAuth2 Authorization Code Theft via Unvalidated redirectUri
CVSS Score
6.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-601 |
| Vendor | a466350665 |
| Product | smart-sso |
| Published | Oct 16, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
a466350665 / smart-sso
0 ≤ 2.1.1
References
hackmd.io: https://hackmd.io/@hieuPenguinnn/smart-sso-oauth2-code-leak-open-redirect github.com: 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 github.com: 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 github.com: 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 github.com: https://github.com/a466350665/smart-sso vulncheck.com: https://www.vulncheck.com/advisories/smart-sso-through-2.1.1-oauth2-authorization-code-theft-via-unvalidated-redirecturi
Credits
hieuPenguinnn