Is CVE-2026-4315 being actively exploited?

CVE-2026-4315 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2026-4315?

CVE-2026-4315 has a CVSS 3.1 base score of 6.5 (MEDIUM).

CVE-2026-4315

MEDIUM · CVSS 6.5EPSS 0.2%EU EUVD

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.

Key facts

CVSS score: 6.5 (v3.1)
Severity: MEDIUM
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-352
EPSS score: 0.2% (14th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2026-17081)
Published: March 30, 2026
NVD last modified: August 28, 2026
Status: Analyzed

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2026-17081 in the EU Vulnerability Database. Last updated in EUVD on August 27, 2026.

View on the EU Vulnerability Database

Affected products

watchguard / firebox cloud
watchguard / firebox m270
watchguard / firebox m290
watchguard / firebox m295
watchguard / firebox m370
watchguard / firebox m390
watchguard / firebox m395
watchguard / firebox m440
watchguard / firebox m4600
watchguard / firebox m470
watchguard / firebox m4800
watchguard / firebox m495
watchguard / firebox m5600
watchguard / firebox m570
watchguard / firebox m5800
watchguard / firebox m590
watchguard / firebox m595
watchguard / firebox m670
watchguard / firebox m690
watchguard / firebox m695
watchguard / firebox nv5
watchguard / firebox t115-w
watchguard / firebox t125
watchguard / firebox t125-w
watchguard / firebox t145
watchguard / firebox t145-w
watchguard / firebox t15
watchguard / firebox t185
watchguard / firebox t20
watchguard / firebox t25
watchguard / firebox t35
watchguard / firebox t40
watchguard / firebox t45
watchguard / firebox t55
watchguard / firebox t70
watchguard / firebox t80
watchguard / firebox t85
watchguard / fireboxv
watchguard / fireware
watchguard / fireware
watchguard / fireware

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

WatchGuard Firebox Security Appliances with Fireware v11.11 and WatchGuard Dimension 2.1 - WatchGuard Technologies, Inc. - Common Criteria CSEC2015010 - archived

References

https://psirt.watchguard.com/CVE-2026-4315(Broken Link)
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00006(Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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