CVE-2026-104084 (GCVE-0-2026-104084)

Vulnerability from cvelistv5 – Published: 2026-10-09 15:08 – Updated: 2026-10-09 19:38
VLAI
Title
SmarterMail < Build 9777 Stale JWT Role Claim Privilege Escalation via Refresh Token
Summary
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.
Severity
8.7 (High)
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
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-09 19:38 UTC
CWE
  • CWE-613 - Insufficient Session Expiration
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 5277 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Smartertools Smartermail Affected: 0 , < Build 9777 (custom)
guessed Create a notification for this product.
Date Public
2026-10-08 00:00
Credits
evan
Show details on NVD website
To clipboard 

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