CVE-2026-104084 — SmarterMail < Build 9777 Stale JWT Role Claim Privilege Escalation via Refresh Token
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 th…
Published: 2026-10-09 · CVSS: 8.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7