TI-2026-70082 Aliases CVE-2026-104082 GHSA-4rp5-r82m-g6p3

Code injection in SmarterMail Volume Mount allows code execution

HIGH 72CWE-94Published 2026-10-09 · Updated 2026-10-27

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-94.

Summary

Smartertools SmarterMail before Build 9777 contains a code injection flaw (CWE-94) in its Volume Mount feature. An attacker holding a SysAdmin-scoped access token can bypass the script directory containment and run code remotely as the SmarterMail service account, with SYSTEM-level privileges. A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00873 59th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix Fixed Smartermail (Smartertools): Build 9777

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
SmarterTools	Smartermail	before Build 9777	Build 9777	Patch available	CNA

Smartermail VendorSmarterTools Affected before Build 9777 Fixed in Build 9777 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:smartertools:smartermail::::::::	—	—	SmarterTools

cpe:2.3:a:smartertools:smartermail:*:*:*:*:*:*:*:* Versions — — ·SmarterTools

Remediation

Update Smartertools SmarterMail to Build 9777.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Fix · CNA Smartermail (Smartertools) Fixed in Build 9777

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-10-09
Smartertools Smartermail Build 9777
3 records Highest priority Priority HIGH 1 HIGH, 2 LOW
Other records, highest priority first
- TI-2026-70084 Stale JWT role claim allows privilege escalation in SmarterMailPriority LOW 39
- TI-2026-70083 Stored mutation XSS in SmarterMail via MathML foreign contentPriority LOW 24
Show all 3 records →

Timeline

2026-10-09 Threatist record created from CVE-2026-104082
2026-10-11 Priority changed: MEDIUM → LOW
2026-10-12 1 new reference · CNA
2026-10-12 Alias added: GHSA-4rp5-r82m-g6p3
2026-10-14 CISA SSVC decision points changed
2026-10-14 Priority changed: LOW → HIGH
2026-10-25 EPSS moved to the 50th–90th percentile

References

Exploit 1

Researcher Blog

Patch 1

Release Notes

TI-2025-32755 Upload arbitrary files in SmarterTools SmarterMail KEVCVSS 3.1CRITICAL 10.0
TI-2026-19690 SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API KEVCVSS 4.0CRITICAL 9.3
TI-2026-19133 SmarterTools SmarterMail < Build 9511 Authentication Bypass via Password Reset API KEVCVSS 4.0CRITICAL 9.3
TI-2019-05110 SmarterTools SmarterMail 16.x before build 6985 allows deserialization of untrusted data. CVSS 3.0CRITICAL 9.8
TI-2020-19061 SmarterTools SmarterTrack 7922 -Information Disclosure CVSS 4.0MEDIUM 6.9
TI-2019-05109 SmarterTools SmarterMail 16.x before build 6985 allows directory traversal. CVSS 3.0MEDIUM 6.5

See all 55 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences