# CVE-2026-111088: Stormshield Network Security stored XSS in VPN log monitoring

Source: https://junglewise.ai/threats/cve-2026-111088-a-stored-cross-site-scripting-vulnerability-exists-in-the-sns  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-111088 · Severity: medium · CVSS 6.5 · Published 2026-10-20

Stormshield Network Security is a firewall and VPN appliance that organizations use to protect networks and remote access. A vulnerability in its VPN log monitoring screen allows authenticated users to inject malicious code that executes when other administrators view the logs, potentially enabling account compromise or unauthorized actions within the firewall.

Technologies: [Stormshield Network Security](https://junglewise.ai/threats/technologies/network-security). Vendors: [Stormshield](https://junglewise.ai/threats/vendors/stormshield).

## Quick answers

**Is CVE-2026-111088 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-111088 being exploited in the wild.

**How severe is CVE-2026-111088?** Medium severity, with a CVSS score of 6.5, published 20 October 2026.

**Which products and versions are affected?** Stormshield Network Security 4.3.0 to 4.3.44, 4.8.0 to 4.8.19, 5.0.0 to 5.0.9, 5.1.0 to 5.1.3.

**Is there a fix for CVE-2026-111088?** Yes: fixed in SNS 4.3.45 QS, 4.8.20 LTSB, 5.0.10, 5.1.4 EA. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-111088 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-111088?** 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 4.3.45 QS, 4.8.20 LTSB, 5.0.10, 5.1.4 EA

## Technical details

A stored cross-site scripting vulnerability exists in the SSL VPN monitoring component where certain log fields are not sanitized, allowing authenticated attackers to inject persistent malicious scripts. The vulnerability requires network access and authentication (low privilege user) but no user interaction beyond normal log viewing. An attacker can achieve high confidentiality impact by stealing session tokens or administrator credentials.

## Affected products

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

## Timeline

- 2026-09-30: disclosed
- 2026-10-20: advisory

## References

- [https://advisories.stormshield.eu/2026-030/](https://advisories.stormshield.eu/2026-030/)

## 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 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)
- [Stormshield Network Security signature verification bypass](https://junglewise.ai/threats/cve-2026-111090-a-logic-error-exists-in-the-signature-verification-routine)