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

Source: https://junglewise.ai/threats/cve-2026-8480-stormshield-network-security-improper-certificate-validation-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-01. Updated: 2026-07-01  
License: CC BY 4.0 with a link back

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](https://junglewise.ai/threats/technologies/network-security). Vendors: [Stormshield](https://junglewise.ai/threats/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/](https://advisories.stormshield.eu/2026-002/)

## Related threats

- [Stormshield Network Security stored XSS in enrollment portal](https://junglewise.ai/threats/cve-2026-113810-a-stored-cross-site-scripting-vulnerability-exists-in-the-sns)
- [Stormshield Network Security stored XSS in enrollment portal](https://junglewise.ai/threats/cve-2026-113808-a-stored-cross-site-scripting-vulnerability-exists-in-the-sns)
- [Stormshield Network Security stored XSS in VPN log monitoring](https://junglewise.ai/threats/cve-2026-111088-a-stored-cross-site-scripting-vulnerability-exists-in-the-sns)
- [Stormshield Network Security improper signature verification in dynamic data files](https://junglewise.ai/threats/cve-2026-113469-a-failure-has-been-identified-in-the-sns-during-dynamic-data)
- [Stormshield Network Security DOM-based XSS in web administration panel](https://junglewise.ai/threats/cve-2026-113465-it-is-possible-to-execute-a-dom-based-cross-site-scripting)