Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-104084

CVE-2026-104084HIGH

Smartertools Smartermail — SmarterMail < Build 9777 Stale JWT Role Claim Privilege Escalation via Refresh Token

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   L   N   H   H   H    8.7   .0027   18.5     —

AFFECTED
  Product      Versions     Fixed
  Smartermail  unspecified  —

TIMELINE
  Oct 1   Reserved by VulnCheck
  Oct 9   Published (CNA: VulnCheck)
  Oct 12  EXPLOIT PUBLISHED — CVE-2026-104084 (Smartertools Smartermail). Public exploit reference added.

CWE-613 · CNA: VulnCheck · CVSS v4.0 · 3 references · NVD status: Awaiting Analysis

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
October 1, 2026	Reserved	Reserved by VulnCheck
October 9, 2026	Published	Published (CNA: VulnCheck)
October 12, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-104084 (Smartertools Smartermail). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Smartertools	Smartermail	—	—	—

Weaknesses

CWE-613

References (3)

Authoritative record: CVE-2026-104084 at cve.org

Vendors: smartertools

Weaknesses: CWE-613

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-104084 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.