CVE-2026-111090
Received Received - Intake

Signature Verification Bypass in Stormshield

Publication date: 2026-10-20

Last updated on: 2026-10-20

Assigner: Airbus

Description
A logic error exists in the signature verification routine resulting in acceptance of unauthenticated update and license files.It is necessary to use only the MyStormshield servers to retrieve update files or licenses, or to use automatic verification via SNS.

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Meta Information

Published
2026-10-20
Last Modified
2026-10-20
Generated
2026-10-20
AI Q&A
2026-10-20
EPSS Evaluated
N/A
NVD
CVE-2026-111090
EUVD
EUVD-2026-104828

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
Stormshield Stormshield Network Security 4.3.0
Stormshield Stormshield Network Security 4.8.0
Stormshield Stormshield Network Security 5.0.0
Stormshield Stormshield Network Security 5.1.0

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-287 When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

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Executive Summary

This vulnerability is a logic error in the signature verification routine of Stormshield Network Security (SNS) that allows acceptance of unauthenticated update and license files. It affects versions 5.1.0 to 5.1.3, 5.0.0 to 5.0.9, 4.8.0 to 4.8.19, and 4.3.0 to 4.3.44.

Detection Guidance

Check SNS versions against affected ranges (5.1.0-5.1.3, 5.0.0-5.0.9, 4.8.0-4.8.19, 4.3.0-4.3.44). Verify update files' SHA-256 hashes via MyStormshield portal or enable automatic verification in SNS settings.

Impact Analysis

This flaw could lead to unauthorized firmware installations or license modifications. Attackers with local access could exploit it to install malicious updates or alter licenses, potentially compromising system integrity, confidentiality, and availability.

Mitigation Strategies

Apply official fixes: upgrade to SNS 5.1.4 EA, 5.0.10, or 4.8.20 LTSB. Ensure update files are retrieved only from MyStormshield servers or enable automatic verification in SNS.

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