# CERT-FR Flags Stormshield Network Security Flaws

Published: 2026-10-19 · Severity: routine · Sectors: Government (National), Technology
Canonical: https://vorant.io/reports/cf19bd59-f7a1-5a0d-b342-d2e44d2bfe30/cert-fr-flags-stormshield-network-security-flaws

> CERT-FR advises multiple vulnerabilities in Stormshield Network Security allow data integrity compromise, XSS injection, and security bypass; patches available.

CERT-FR has published an advisory covering multiple vulnerabilities in Stormshield Network Security (SNS), a firewall/UTM product widely used in French and European enterprise and government networks. The vulnerabilities affect SNS versions 5.0.x prior to 5.0.10, 5.1.x prior to 5.1.4 EA, and versions prior to 4.8.20 LTSB. Impacts include atteinte à l'intégrité des données (data integrity compromise), an indirect remote code injection (reflected XSS), and a security policy bypass; at least one additional issue type is unspecified by the vendor.

One CVE is referenced (CVE-2026-111090) alongside four Stormshield vendor bulletins (STORM-2026-022, 030, 031, 032) published 16 October 2026, each likely corresponding to a distinct flaw bundled into this single CERT-FR advisory. No in-the-wild exploitation is reported. Defenders running Stormshield Network Security should consult the vendor advisories for the full technical details and apply the corrected versions (5.0.10+, 5.1.4 EA+, or 4.8.20 LTSB+) as soon as possible, given the product's common deployment as perimeter security infrastructure where a bypass of security policy could have significant downstream impact.

## Mentioned in this report

- Vulnerabilities: CVE-2026-111090

Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1339

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