{"id":"CVE-2026-104084","state":"PUBLISHED","title":"SmarterMail < Build 9777 Stale JWT Role Claim Privilege Escalation via Refresh Token","description":"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.","publishedAt":"2026-10-09T15:08:23.453Z","updatedAt":"2026-10-27T01:30:37.477Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["Smartertools Smartermail"],"affected":[{"vendor":"Smartertools","product":"Smartermail","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"Build 9777","versionType":"custom"}]}],"references":["https://www.smartertools.com/smartermail/release-notes/current#/9526:~:text=Build%209777%20(Oct%208%2C%202026)","https://blog.evan.lat/posts/sm/","https://www.vulncheck.com/advisories/smartermail-build-9777-stale-jwt-role-claim-privilege-escalation-via-refresh-token"],"weaknesses":["CWE-613"],"ingestedAt":"2026-10-29T20:10:23.711Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/104xxx/CVE-2026-104084.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-104084","state":"PUBLISHED","datePublished":"2026-10-09T15:08:23.453Z","dateUpdated":"2026-10-27T01:30:37.477Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-01T18:02:50.085Z"},"containers":{"cna":{"title":"SmarterMail < Build 9777 Stale JWT Role Claim Privilege Escalation via Refresh Token","descriptions":[{"lang":"en","value":"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. 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