Vulnerability in Smartertools Smartermail
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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- www.smartertools.com/smartermail/release-notes/current (release-notes, patch)
- www.vulncheck.com/advisories/smartermail-build-9777-stale-jwt-role-claim-privil… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-104084?
- CVE-2026-104084 is a high-severity vulnerability in Smartertools Smartermail, classified under Insufficient Session Expiration. CVSS score: 8.8/10. Published 2026-10-09.
- How severe is CVE-2026-104084?
- High severity. CVSS v3 base score is 8.8 out of 10.