CVE-2026-66362
HIGHDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 28% of all known CVEs.
References
Related Vulnerabilities
Other CWE-76 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2024-1883 | Medium | 6.3 | 61% | - | Fix |
| CVE-2024-34359 | Critical | 9.6 | 26% | - | - |
| CVE-2023-0493 | Medium | 5.3 | 7.9% | - | Fix |
| CVE-2024-1882 | High | 7.2 | 1.4% | - | Fix |
| CVE-2026-28292 | Critical | 9.8 | 1.3% | - | Fix |
| CVE-2024-2952 | Critical | 9.8 | 1.3% | - | Fix |
Common questions
How do I fix CVE-2026-66362?
No published fix for CVE-2026-66362 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-66362 being actively exploited?
Not that we know of. CVE-2026-66362 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.35% is the estimated probability that it will be exploited in the next 30 days. That is higher than 28% of all scored CVEs.
How severe is CVE-2026-66362?
CVE-2026-66362 has a CVSS v3 base score of 8.1, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-03.