---
title: "CVE-2026-111090: MyStormshield - Authentication Bypass"
description: "MyStormshield contains a broken authentication caused by a logic error in the signature verification routine, letting attackers accept unauthenticated update and license files, exploit requires use of non-MyStormshield servers or lack of automatic SNS verification."
url: https://panop.io/threat-heartbeat/CVE-2026-111090/
---

# CVE-2026-111090 MyStormshield - Authentication Bypass

MyStormshield contains a broken authentication caused by a logic error in the signature verification routine, letting attackers accept unauthenticated update and license files, exploit requires use of non-MyStormshield servers or lack of automatic SNS verification.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-111090)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Published

20 October 2026

Updated

20 October 2026

Weakness

[CWE-287](https://cwe.mitre.org/data/definitions/287.html)

## Vendor fix

Use only MyStormshield servers for updates or enable automatic verification via SNS.

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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-111090](https://nvd.nist.gov/vuln/detail/CVE-2026-111090)
- [https://advisories.stormshield.eu/2026-031/](https://advisories.stormshield.eu/2026-031/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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