# CVE-2026-104082: SmarterMail remote code execution with SysAdmin token

Source: https://junglewise.ai/threats/cve-2026-104082-smartermail-before-build-9777-contains-a-remote-code-execution  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-09. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-104082 · Severity: high · CVSS 7.2 · Published 2026-10-09

SmarterMail is an enterprise email and groupware server used by thousands of organizations worldwide. An attacker with administrative access to SmarterMail can exploit a series of security gaps to bypass protection controls and upload malicious code that executes with SYSTEM privileges, potentially compromising the entire email server and accessing all stored data.

Technologies: [SmarterTools SmarterMail](https://junglewise.ai/threats/technologies/smartermail). Vendors: [SmarterTools](https://junglewise.ai/threats/vendors/smartertools).

## Quick answers

**Is CVE-2026-104082 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-104082 being exploited in the wild.

**How severe is CVE-2026-104082?** High severity, with a CVSS score of 7.2, published 9 October 2026.

**Which products and versions are affected?** SmarterTools SmarterMail before build 9777.

**Is there a fix for CVE-2026-104082?** Yes: fixed in SmarterMail build 9777. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-104082 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-104082?** Check whether you run SmarterTools SmarterMail at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in SmarterMail build 9777

## Technical details

A SysAdmin-scoped access token holder can chain multiple vulnerabilities to achieve RCE: bypassing Volume Mount script containment by creating a domain with an arbitrary FileStore in the Scripts directory, disclosing the Scripts path via AddOrUpdateMount, clearing upload restrictions via the global-mail endpoint, uploading a malicious script, and triggering RunScript execution before validation. The attack results in code execution as the SmarterMail service account with SYSTEM privileges.

## Affected products

- SmarterTools SmarterMail before build 9777

## Timeline

- 2026-10-09: disclosed
- 2026-10-08: patched

## References

- [https://blog.evan.lat/posts/sm/](https://blog.evan.lat/posts/sm/)
- [https://www.smartertools.com/smartermail/release-notes/current](https://www.smartertools.com/smartermail/release-notes/current)

## Related threats

- [SmarterMail JWT privilege escalation via stale refresh tokens](https://junglewise.ai/threats/cve-2026-104084-smartermail-before-build-9777-contains-a-privilege-escalation)
- [SmarterMail stored mutation cross-site scripting in HTML sanitizer](https://junglewise.ai/threats/cve-2026-104083-smartermail-before-build-9777-contains-a-stored-mutation-cross)
- [SmarterTools SmarterMail local file inclusion in reporting API](https://junglewise.ai/threats/cve-2026-7807-smartertools-smartermail-local-file-inclusion-in-reporting-api)
- [SmarterTools SmarterMail cryptographic weakness in sharing endpoints](https://junglewise.ai/threats/cve-2026-40514-smartertools-smartermail-cryptographic-weakness-in-sharing)
- [SmarterTools SmarterMail auth bypass in ConnectToHub API](https://junglewise.ai/threats/cve-2026-24423-smartertools-smartermail-auth-bypass-in-connecttohub-api)