# CVE-2026-34801: Endian Firewall stored XSS in DHCP fixed leases remark parameter

Source: https://junglewise.ai/threats/cve-2026-34801-endian-firewall-stored-xss-in-dhcp-fixed-leases-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-2026-34801 · Severity: medium · CVSS 6.4 · Published 2026-04-02

Endian Firewall, a security appliance used to protect and manage network traffic, is vulnerable to a security flaw in its DHCP management interface. An authorized user can inject malicious scripts into the system's configuration notes, which will then execute in the browsers of other administrators who view that 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-2026-34801 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-34801 being exploited in the wild.

**How severe is CVE-2026-34801?** Medium severity, with a CVSS score of 6.4, published 2 April 2026.

**Which products and versions are affected?** Endian Firewall Community up to and including 3.3.25.

**Is there a fix for CVE-2026-34801?** 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-2026-34801 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-34801?** 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 vulnerability is located in the '/manage/dhcp/fixed_leases/' endpoint and is triggered by insufficient sanitization of the 'remark' parameter. An authenticated attacker with low privileges can submit a crafted string containing malicious JavaScript. This script is stored on the server and executed in the context of any user (typically an administrator) who subsequently navigates to the fixed leases management page. This can be used to hijack administrative sessions or perform unauthorized configuration changes.

## Affected products

- Endian Firewall Community up to and including 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-manage-dhcp-fixed-leases-remark-stored-cross-site-scripting](https://www.vulncheck.com/advisories/endian-firewall-manage-dhcp-fixed-leases-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)