Is CVE-2026-8480 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-8480 being exploited in the wild.

How severe is CVE-2026-8480?

Medium severity, with a CVSS score of 4.3, published 1 July 2026.

Which products and versions are affected?

Stormshield Network Security 4.3.0 to 4.3.41, 4.4.0 to 4.8.15, 5.0.2 EA to 5.0.5.

Is there a fix for CVE-2026-8480?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-8480 attacked?

It is attacked from the adjacent network, in a network appliance.

Am I affected by CVE-2026-8480?

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-2026-8480: Stormshield Network Security improper certificate validation in admin portal

CVE-2026-8480 · Severity: medium · CVSS 4.3 · Published 2026-07-01

Stormshield Network Security firewalls contain a flaw where revoked security certificates are not properly invalidated for administrative access. This means a former employee or an unauthorized individual possessing a revoked certificate could still log into the management portal. An attacker with this access could potentially view sensitive configuration data or manage the security appliance.

Technologies: Stormshield Network Security. Vendors: Stormshield.

Quick answers

Is CVE-2026-8480 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-8480 being exploited in the wild.
How severe is CVE-2026-8480?: Medium severity, with a CVSS score of 4.3, published 1 July 2026.
Which products and versions are affected?: Stormshield Network Security 4.3.0 to 4.3.41, 4.4.0 to 4.8.15, 5.0.2 EA to 5.0.5.
Is there a fix for CVE-2026-8480?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-8480 attacked?: It is attacked from the adjacent network, in a network appliance.
Am I affected by CVE-2026-8480?: 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.

Technical details

An improper certificate validation vulnerability (CWE-295) exists in the captive-admin portal of Stormshield Network Security (SNS). The system fails to check the revocation status of client certificates in real-time, allowing a revoked certificate to remain valid for authentication. The attack vector is restricted to the adjacent network. Attackers possessing a revoked but otherwise valid certificate can gain administrative access to the portal. The issue is resolved in versions 5.0.6, 4.8.16, and 4.3.42; a manual workaround involves restarting the 'sld' service after certificate revocation.

Affected products

Stormshield Stormshield Network Security 4.3.0 to 4.3.41, 4.4.0 to 4.8.15, 5.0.2 EA to 5.0.5

Timeline

2025-05-11: disclosed: Date discovered
2026-02-19: advisory: Initial advisory release
2026-07-01: advisory: NVD publication date

References

https://advisories.stormshield.eu/2026-002/

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