How severe is CVE-2026-34803?

CVE-2026-34803 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-34803 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34803?

CVE-2026-34803 affects Endian Firewall Community. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34803?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-34803 have an EU (EUVD) identifier?

Yes. CVE-2026-34803 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18288.

When was CVE-2026-34803 published?

CVE-2026-34803 was published on 2026-04-02 and last updated on 2026-06-17.

CVE-2026-34803

CVE-2026-34803 is a medium-severity vulnerability in Endian Firewall Community with a CVSS 3.x base score of 6.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.4)
CVSS v4: 5.1
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18288
Weakness: CWE-79
Affected product: Endian Firewall Community
Published: 2026-04-02
Last modified: 2026-06-17

Description

Endian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the name parameter to /manage/qos/classes/. An authenticated attacker can inject arbitrary JavaScript that is stored and executed when other users view the affected page.

Frequently asked questions

What is CVE-2026-34803?: Endian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the name parameter to /manage/qos/classes/. An authenticated attacker can inject arbitrary JavaScript that is stored and executed when other users view the affected page.
How severe is CVE-2026-34803?: CVE-2026-34803 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-34803 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34803?: CVE-2026-34803 affects Endian Firewall Community. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34803?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34803 have an EU (EUVD) identifier?: Yes. CVE-2026-34803 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18288.
When was CVE-2026-34803 published?: CVE-2026-34803 was published on 2026-04-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:endian:firewall_community:*:*:*:*:*:*:*:*

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