CVE-2026-66362Network attack vector

Configuration injection via unescaped authentication fields

Published Sep 2, 2026 · Updated Sep 3, 2026

Configuration injection in F5 NGINX Gateway Fabric 2.5.0 through 2.6.7 allows remote authenticated users to inject directives. The configuration generator renders clientID, cookieName, and referenced clientSecret values into NGINX templates without sanitization or escaping. Kubernetes RBAC write access to the affected resources and an NGINX Plus data plane are required; injected directives can alter control-plane-generated NGINX behavior.

CVSS severity8.1
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Configuration injection in F5 NGINX Gateway Fabric 2.5.0 through 2.6.7 allows remote authenticated users to inject directives. The configuration generator renders clientID, cookieName, and referenced clientSecret values into NGINX templates without sanitization or escaping. Kubernetes RBAC write access to the affected resources and an NGINX Plus data plane are required; injected directives can alter control-plane-generated NGINX behavior.

The record

CVE
CVE-2026-66362
Published
Sep 2, 2026
Updated
Sep 3, 2026
Vendor
F5 Networks
Product
NGINX Gateway Fabric
Classifications
CWE-76
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 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=2.5.0 <2.6.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

F5 Networks · NGINX Gateway Fabricversion=2.5.0 <2.6.8

Published CVSS scores

8.6F5CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
8.1F5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-76Improper Neutralization of Equivalent Special Elements

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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