CVE-2026-104084 SmarterMail - Privilege Escalation

SmarterMail < 9777 contains a privilege escalation caused by JWT tokens embedding role claims that are not revalidated on refresh, letting attackers retain higher privileges by replaying stale tokens, exploit requires captured refresh token.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.27% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Privilege Escalation
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
9 October 2026
Updated
15 October 2026
Weakness
CWE-613

Vendor fix

Update to build 9777 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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