Vulnerability details
CVE-2026-66362
F5 NGINX Gateway Fabric
NGF vulnerability
CVSS 4.0
8.6High
Official description
Description: When NGINX Plus is configured as the data plane for NGINX Gateway Fabric, an injection vulnerability exists in the NGINX configuration generator component of NGINX Gateway Fabric. User-supplied string values from the Authentication Filter Custom Resource Definition clientID or cookieName fields, or in the clientSecret field of a Secret referenced by an Authentication Filter, are rendered directly into NGINX configuration templates without sanitization or escaping. Impact: An authenticated attacker with permission to create or modify these resources may craft values that inject arbitrary NGINX configuration directives. This is a control plane issue; there is no data plane exposure.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.6High | 4.0 | CVEProject cvelistV5 (CNA) (f5) | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
| 8.1High | 3.1 | CVEProject cvelistV5 (CNA) (f5) | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| F5 | NGINX Gateway Fabric | 2.5.0 ≤ v < 2.6.8 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://my.f5.com/manage/s/article/K000162600 vendor-advisory
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Details
- Published
- 2026-09-02
- Last updated
- 2026-09-03
- State
- Published
- Assigner (CNA)
- f5
Exploit prediction (EPSS)
0.57%
Probability of exploitation in 30 days
47.5%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-76