RCE in Smartertools Smartermail
CVE-2026-104082
SmarterMail before build 9777 contains a remote code execution vulnerability that allows an attacker holding a SysAdmin-scoped access token to bypass the Volume Mount script-directory containment control by provisioning a new mail domain with an arbitrary FileStore root path inside the trusted Scripts directory via the domain-put endpoint. Attackers can disclose the Scripts path through the AddOrUpdateMount endpoint, clear the upload extension blacklist via the global-mail endpoint, then upload a malicious script through the ordinary mail file-storage upload API so that saving a CommandMount triggers RunScript before validation, resulting in a reverse shell executing as the SmarterMail service account with SYSTEM-level privileges.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/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-sysadmin-remote-code-execut… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-104082?
- CVE-2026-104082 is a high-severity vulnerability in Smartertools Smartermail, classified under Code Injection. CVSS score: 7.2/10. Published 2026-10-09.
- How severe is CVE-2026-104082?
- High severity. CVSS v3 base score is 7.2 out of 10.