HIGH 8.7 NVD
CVE-2026-104084
SmarterMail before build 9777 contains a privilege escalation vulnerability where JWT access and refresh tokens embed a role claim at issuance that is not reval
SmarterMail before build 9777 contains a privilege escalation vulnerability where JWT access and refresh tokens embed a role claim at issuance that is not revalidated against the account's current role when redeemed through POST /api/v1/auth/refresh-token. Attackers who capture a refresh token issued before an administrator demotion, or a demoted user whose session was not actively polling at the time of demotion, can replay the stale token to obtain a new access token retaining the higher-privilege role (such as DomainAdmin or SysAdmin) until natural token expiry.
References
- https://www.smartertools.com/smartermail/release-notes/current#/9526:~:text=Build%209777%2
- https://www.vulncheck.com/advisories/smartermail-build-9777-stale-jwt-role-claim-privilege
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-10-09 via NVD.
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