TI-2026-76746 Aliases CVE-2026-111090 GHSA-cg8h-hvwf-mx5f

Stormshield Network Security accepts unauthenticated update files

LOW 35CWE-287Published 2026-10-20 · Updated 2026-10-20

Key facts

Attack vector: Local
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-287.

Summary

Stormshield Network Security from 4.3.0 through 4.3.44, from 4.8.0 through 4.8.19, from 5.0.0 through 5.0.9, and from 5.1.0 through 5.1.3 is affected. A logic error in the signature verification routine causes the product to accept unauthenticated update and license files (CWE-287). An attacker with local access and no privileges can exploit this with user interaction, and the impact on confidentiality, integrity and availability is high.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00165 5th percentileScored 2026-11-07

Fix Fixed Stormshield Network Security (Stormshield): 4.8.20 LTSB, 5.0.10, 5.1.4 EA +1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Stormshield	Stormshield Network Security	4.3.0 – 4.3.44; 4.8.0 – 4.8.19; 5.0.0 – 5.0.9; 5.1.0 – 5.1.3	4.8.20 LTSB, 5.0.10, 5.1.4 EA, 4.3.45 QS	Patch available	CNA

Stormshield Network Security VendorStormshield Affected 4.3.0 – 4.3.44; 4.8.0 – 4.8.19; 5.0.0 – 5.0.9; 5.1.0 – 5.1.3 Fixed in 4.8.20 LTSB, 5.0.10, 5.1.4 EA, 4.3.45 QS Patch available CNA

Remediation

Upgrade to 4.3.45 QS, 4.8.20 LTSB, 5.0.10 or 5.1.4 EA. Until the update is applied, retrieve update files and licenses only from the MyStormshield servers or use automatic verification via SNS.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Fix · CNA Stormshield Network Security (Stormshield) Fixed in 4.8.20 LTSB, 5.0.10, 5.1.4 EA, 4.3.45 QS

Timeline

2026-10-20 Threatist record created from CVE-2026-111090
2026-10-20 Alias added: GHSA-cg8h-hvwf-mx5f
2026-10-20 Fix available: Stormshield/Stormshield Network [email protected] QS · CNA
2026-10-20 CISA SSVC decision points changed
2026-10-20 Priority changed: MEDIUM → LOW

References

Other 1

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

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TI-2022-13924 The llhttp parser <v14.20.1, <v16.17.1 and <v18.9.1 in the http module in Node.js does… CVSS 3.1MEDIUM 6.5
TI-2023-06741 Buffer overflow in Cisco Secure Web Appliance CVSS 3.1CRITICAL 9.8
TI-2022-13925 The llhttp parser <v14.20.1, <v16.17.1 and <v18.9.1 in the http module in Node.js does… CVSS 3.1MEDIUM 6.5
TI-2022-04067 Double free after calling PEM_read_bio_ex CVSS 3.1HIGH 7.5

See all 68 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences