CVE-2026-34799: Endian Firewall stored XSS in dnsmasq hosts remark parameter

CVE-2026-34799 · Severity: medium · CVSS 6.4 · Published 2026-04-02

Endian Firewall, a security appliance used to protect network traffic, is vulnerable to a security flaw in its administrative interface. An authorized user can inject malicious code into the system's host management settings. This code is then saved and automatically runs when other administrators view the page, potentially allowing an attacker to hijack sessions or perform unauthorized actions on the firewall.

Technologies: Endian Firewall Community. Vendors: Endian.

Quick answers

Is CVE-2026-34799 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-34799 being exploited in the wild.
How severe is CVE-2026-34799?
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-2026-34799?
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-2026-34799 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-34799?
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/dnsmasq/hosts/' endpoint and is triggered by insufficient sanitization of the 'remark' parameter. An authenticated attacker with network access to the management interface can submit a malicious payload that is permanently stored on the server. When another user (such as an administrator) accesses the hosts management page, the malicious JavaScript executes in the context of their browser session. This can lead to session hijacking, unauthorized configuration changes, or further escalation within the management console.

Affected products

  • Endian Firewall Community <= 3.3.25

Timeline

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

References

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