CVE-2026-4315Network attack vector

WebUI denial of service via administrator-targeted CSRF

Published Mar 30, 2026 · Updated Mar 30, 2026

CSRF in affected WatchGuard Fireware OS WebUI releases allows remote attackers to interrupt the WebUI through a malicious page. WatchGuard has not published the affected WebUI request or the anti-CSRF validation failure that permits the forged action. Exploitation requires an authenticated administrator's browser to visit attacker-controlled content, and the reported effect is limited to WebUI service interruption.

CVSS severity7.1
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF in affected WatchGuard Fireware OS WebUI releases allows remote attackers to interrupt the WebUI through a malicious page. WatchGuard has not published the affected WebUI request or the anti-CSRF validation failure that permits the forged action. Exploitation requires an authenticated administrator's browser to visit attacker-controlled content, and the reported effect is limited to WebUI service interruption.

The record

CVE
CVE-2026-4315
Published
Mar 30, 2026
Updated
Mar 30, 2026
Vendor
WatchGuard Technologies
Product
Fireware OS
Classifications
CWE-352, CAPEC-62, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=11.8 <=11.12.4+541730
  2. Affected versionversion=12.0 <=12.11.8
  3. Affected versionversion=12.5 <=12.5.17
  4. Affected versionversion=2025.1 <=2026.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WatchGuard Technologies · Fireware OSversion=11.8 <=11.12.4+541730; version=12.0 <=12.11.8; version=12.5 <=12.5.17; version=2025.1 <=2026.1.2

Published CVSS scores

7.1WatchGuard Technologies, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
CAPEC-62Cross Site Request Forgery
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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