Is CVE-2026-34816 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-34816 being exploited in the wild.

How severe is CVE-2026-34816?

Medium severity, with a CVSS score of 6.4, published 2 April 2026.

Which products and versions are affected?

Endian Firewall 3.3.25 and prior.

Is there a fix for CVE-2026-34816?

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-2026-34816 attacked?

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

Am I affected by CVE-2026-34816?

Check whether you run Endian Firewall Community. 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-2026-34816: Endian Firewall stored XSS in SMTP scan domain routing

CVE-2026-34816 · Severity: medium · CVSS 6.4 · Published 2026-04-02

Endian Firewall, a security appliance used to protect corporate networks, is vulnerable to a security flaw in its email scanning management interface. An authorized user can inject malicious scripts into the system's domain routing settings. These scripts are then executed in the browsers of other administrators who view the page, potentially leading to unauthorized actions or the theft of sensitive session information.

Technologies: Endian Firewall Community. Vendors: Endian.

Quick answers

Is CVE-2026-34816 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-34816 being exploited in the wild.
How severe is CVE-2026-34816?: Medium severity, with a CVSS score of 6.4, published 2 April 2026.
Which products and versions are affected?: Endian Firewall 3.3.25 and prior.
Is there a fix for CVE-2026-34816?: 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-2026-34816 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-34816?: Check whether you run Endian Firewall Community. 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/smtpscan/domainrouting/' endpoint and is triggered by insufficient sanitization of the 'domain' parameter. An authenticated attacker with network access to the management interface can submit a malicious payload that is permanently stored on the server. When an administrative user subsequently navigates to the domain routing configuration page, the malicious JavaScript executes within the context of their session. This can be used to perform unauthorized administrative actions or exfiltrate session cookies.

Affected products

Endian Firewall 3.3.25 and prior

Timeline

2026-04-02: disclosed: Initial disclosure by VulnCheck
2026-04-02: advisory: NVD publication date

References

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