Vulnerability · Published Oct 16, 2026 · Assigned by VulnCheck

CVE-2026-111622smart-sso through 2.1.1 OAuth2 Authorization Code Theft via Unvalidated redirectUri

Medium 6.8

In plain English

A medium-severity open redirect in smart-sso from a466350665. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).

Severity (CVSS 3.1)6.8Medium

Exploit odds (30 days)0.4%top 62.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
a466350665	smart-sso	0 – through 2.1.1

Weakness: CWE-601 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

References

https://hackmd.io/@hieuPenguinnn/smart-sso-oauth2-code-leak-open-redirect third-party-advisory
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 technical-description
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 technical-description
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 technical-description
https://github.com/a466350665/smart-sso product
VulnCheck Advisory: smart-sso through 2.1.1 OAuth2 Authorization Code Theft via Unvalidated redirectUri third-party-advisory