How severe is CVE-2026-4315?

CVE-2026-4315 has a CVSS 4.0 base score of 7.1, rated high severity.

Is CVE-2026-4315 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-4315?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-4315 have an EU (EUVD) identifier?

Yes. CVE-2026-4315 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17081.

When was CVE-2026-4315 published?

CVE-2026-4315 was published on 2026-03-30 and last updated on 2026-06-17.

CVE-2026-4315

CVE-2026-4315 is a high-severity vulnerability with a CVSS 4.0 base score of 7.1. 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-352.

Key facts

Severity: High (CVSS 4.0 base score 7.1)
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17081
Weakness: CWE-352
Published: 2026-03-30
Last modified: 2026-06-17

Description

A Cross-Site Request Forgery (CSRF) vulnerability in the WatchGuard Fireware OS WebUI could allow a remote attacker to trigger a denial-of-service (DoS) condition in the Fireware Web UI by convincing an authenticated administrator into visiting a malicious web page.This issue affects Fireware OS: 11.8 through 11.12.4+541730, 12.0 through 12.11.8, and 2025.1 through 2026.1.2.

Frequently asked questions

What is CVE-2026-4315?: A Cross-Site Request Forgery (CSRF) vulnerability in the WatchGuard Fireware OS WebUI could allow a remote attacker to trigger a denial-of-service (DoS) condition in the Fireware Web UI by convincing an authenticated administrator into visiting a malicious web page.This issue affects Fireware OS: 11.8 through 11.12.4+541730, 12.0 through 12.11.8, and 2025.1 through 2026.1.2.
How severe is CVE-2026-4315?: CVE-2026-4315 has a CVSS 4.0 base score of 7.1, rated high severity.
Is CVE-2026-4315 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-4315?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-4315 have an EU (EUVD) identifier?: Yes. CVE-2026-4315 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17081.
When was CVE-2026-4315 published?: CVE-2026-4315 was published on 2026-03-30 and last updated on 2026-06-17.

References

https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00006

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