Stormshield Network Security up to 4.3.44/4.8.19/5.0.9/5.1.3 Signature Verification improper authentication

Summaryinfo

A vulnerability was found in Stormshield Network Security up to 4.3.44/4.8.19/5.0.9/5.1.3. It has been classified as very critical. The impacted element is an unknown function of the component Signature Verification. The manipulation leads to improper authentication. This vulnerability is listed as CVE-2026-111090. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Stormshield Network Security up to 4.3.44/4.8.19/5.0.9/5.1.3. It has been rated as very critical. This issue affects an unknown code block of the component Signature Verification. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at advisories.stormshield.eu. The identification of this vulnerability is CVE-2026-111090 since 10/15/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/20/2026).

Upgrading to version 4.8.20 LTSB, 5.0.10 or 5.1.4 EA eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-104828). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• Stormshield

Name

• Network Security

Version

• 4.3.0
• 4.3.1
• 4.3.2
• 4.3.3
• 4.3.4
• 4.3.5
• 4.3.6
• 4.3.7
• 4.3.8
• 4.3.9
• 4.3.10
• 4.3.11
• 4.3.12
• 4.3.13
• 4.3.14
• 4.3.15
• 4.3.16
• 4.3.17
• 4.3.18
• 4.3.19
• 4.3.20
• 4.3.21
• 4.3.22
• 4.3.23
• 4.3.24
• 4.3.25
• 4.3.26
• 4.3.27
• 4.3.28
• 4.3.29
• 4.3.30
• 4.3.31
• 4.3.32
• 4.3.33
• 4.3.34
• 4.3.35
• 4.3.36
• 4.3.37
• 4.3.38
• 4.3.39
• 4.3.40
• 4.3.41
• 4.3.42
• 4.3.43
• 4.3.44
• 4.8.0
• 4.8.1
• 4.8.2
• 4.8.3
• 4.8.4
• 4.8.5
• 4.8.6
• 4.8.7
• 4.8.8
• 4.8.9
• 4.8.10
• 4.8.11
• 4.8.12
• 4.8.13
• 4.8.14
• 4.8.15
• 4.8.16
• 4.8.17
• 4.8.18
• 4.8.19
• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.0.4
• 5.0.5
• 5.0.6
• 5.0.7
• 5.0.8
• 5.0.9
• 5.1.0
• 5.1.1
• 5.1.2
• 5.1.3

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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