Is CVE-2026-111090 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-111090 being exploited in the wild.

How severe is CVE-2026-111090?

High severity, with a CVSS score of 7.8, published 20 October 2026.

Which products and versions are affected?

Stormshield Network Security 5.1.0 to 5.1.3, 5.0.0 to 5.0.9, 4.8.0 to 4.8.19, 4.3.0 to 4.3.44.

How is CVE-2026-111090 attacked?

It is attacked with local access.

Am I affected by CVE-2026-111090?

Check whether you run Stormshield Network Security 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.

CVE-2026-111090: Stormshield Network Security signature verification bypass

CVE-2026-111090 · Severity: high · CVSS 7.8 · Published 2026-10-20

Stormshield Network Security (SNS), a network security appliance used to protect enterprise networks, contains a flaw in its firmware and license file signature verification. An attacker can bypass authentication checks and install malicious updates or licenses, leading to complete system compromise including data exposure and service disruption.

Technologies: Stormshield Network Security. Vendors: Stormshield.

Quick answers

Is CVE-2026-111090 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-111090 being exploited in the wild.
How severe is CVE-2026-111090?: High severity, with a CVSS score of 7.8, published 20 October 2026.
Which products and versions are affected?: Stormshield Network Security 5.1.0 to 5.1.3, 5.0.0 to 5.0.9, 4.8.0 to 4.8.19, 4.3.0 to 4.3.44.
Is there a fix for CVE-2026-111090?: Yes: fixed in SNS 5.1.4 EA, SNS 5.0.10, SNS 4.8.20 LTSB. Until then: Verify the SHA-256 hash of each update file against the reference hashes available in the MyStormshield portal, or use only official MyStormshield servers for retrieving update files and licenses with automatic SNS signature verification enabled. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-111090 attacked?: It is attacked with local access.
Am I affected by CVE-2026-111090?: Check whether you run Stormshield Network Security 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: SNS 5.1.4 EA, SNS 5.0.10, SNS 4.8.20 LTSB

Verify the SHA-256 hash of each update file against the reference hashes available in the MyStormshield portal, or use only official MyStormshield servers for retrieving update files and licenses with automatic SNS signature verification enabled.

Technical details

A logic error in the signature verification routine of SNS firmware update and license file processing allows acceptance of unauthenticated files. The vulnerability requires local access and user interaction (file placement/installation), but grants high impact across confidentiality, integrity, and availability. A fix is available in SNS 5.1.4 EA, 5.0.10, and 4.8.20 LTSB.

Affected products

Stormshield Network Security 5.1.0 to 5.1.3, 5.0.0 to 5.0.9, 4.8.0 to 4.8.19, 4.3.0 to 4.3.44

Timeline

2026-08-03: disclosed
2026-10-16: advisory
2026-10-16: patched

References

https://advisories.stormshield.eu/2026-031/

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