Is CVE-2026-34817 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-34817 being exploited in the wild.

How severe is CVE-2026-34817?

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-2026-34817?

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-2026-34817 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-34817?

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.

CVE-2026-34817: Endian Firewall stored XSS in smtprouting.cgi

CVE-2026-34817 · Severity: medium · CVSS 6.4 · Published 2026-04-02

Endian Firewall, a security appliance used to protect corporate and community networks, contains a vulnerability that allows an attacker to inject malicious scripts into the management interface. An attacker with low-level access can use this to target administrators, potentially leading to the theft of session information or unauthorized actions within the firewall's control panel. This could compromise the integrity of the network security settings.

Technologies: Endian Firewall Community. Vendors: Endian.

Quick answers

Is CVE-2026-34817 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-34817 being exploited in the wild.
How severe is CVE-2026-34817?: 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-2026-34817?: 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-2026-34817 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-34817?: 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/smtprouting.cgi component, specifically within the handling of the 'ADDRESS BCC' parameter. An authenticated attacker with network access to the management interface can submit a crafted request containing malicious JavaScript. This script is then stored on the server and executed in the browser of any user (typically an administrator) who subsequently views the SMTP routing configuration page. This can lead to session hijacking or 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

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