# CVE-2026-34806: Endian Firewall stored XSS in snat.cgi remark parameter

Source: https://junglewise.ai/threats/cve-2026-34806-endian-firewall-stored-xss-in-snat-cgi-remark-parameter  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-02. Updated: 2026-07-24  
License: CC BY 4.0 with a link back

CVE-2026-34806 · Severity: medium · CVSS 6.4 · Published 2026-04-02

Endian Firewall, a security appliance used to protect networks, contains a vulnerability that allows an authenticated user to inject malicious scripts into the management interface. These scripts are saved on the device and will run automatically when other administrators view the affected configuration page. This could lead to unauthorized actions being performed on behalf of other administrators or the theft of sensitive session information.

Technologies: [Endian Firewall Community](https://junglewise.ai/threats/technologies/firewall-community). Vendors: [Endian](https://junglewise.ai/threats/vendors/endian).

## Quick answers

**Is CVE-2026-34806 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-34806 being exploited in the wild.

**How severe is CVE-2026-34806?** Medium severity, with a CVSS score of 6.4, published 2 April 2026.

**Which products and versions are affected?** Endian Firewall Community <= 3.3.25.

**Is there a fix for CVE-2026-34806?** 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-2026-34806 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-34806?** Check whether you run Endian Firewall Community 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

A stored cross-site scripting (XSS) vulnerability exists in Endian Firewall version 3.3.25 and earlier. The flaw is located in the '/cgi-bin/snat.cgi' component, specifically due to improper neutralization of the 'remark' parameter. An authenticated attacker with network access to the management interface can submit a crafted request containing malicious JavaScript. This script is stored on the server and executes in the context of any user (such as a high-privileged administrator) who subsequently views the SNAT configuration page. This can result in session hijacking or unauthorized configuration changes.

## Affected products

- Endian Firewall Community <= 3.3.25

## Timeline

- 2026-04-02: disclosed
- 2026-04-02: advisory

## References

- [https://help.endian.com/hc/en-us/sections/360004371358-Community](https://help.endian.com/hc/en-us/sections/360004371358-Community)
- [https://www.vulncheck.com/advisories/endian-firewall-cgi-bin-snat-cgi-remark-stored-cross-site-scripting](https://www.vulncheck.com/advisories/endian-firewall-cgi-bin-snat-cgi-remark-stored-cross-site-scripting)

## Related threats

- [Endian Firewall stored XSS in remark parameter](https://junglewise.ai/threats/cve-2026-34823-endian-firewall-stored-xss-in-remark-parameter)
- [Endian Firewall stored XSS in certificate management interface](https://junglewise.ai/threats/cve-2026-34822-endian-firewall-stored-xss-in-certificate-management-interface)
- [Endian Firewall stored XSS in VPN user remark parameter](https://junglewise.ai/threats/cve-2026-34821-endian-firewall-stored-xss-in-vpn-user-remark-parameter)
- [Endian Firewall stored XSS in IPsec remark parameter](https://junglewise.ai/threats/cve-2026-34820-endian-firewall-stored-xss-in-ipsec-remark-parameter)
- [Endian Firewall stored XSS in openvpnclient.cgi](https://junglewise.ai/threats/cve-2026-34819-endian-firewall-stored-xss-in-openvpnclient-cgi)