CVE-2026-104939CWE-303

CVE-2026-104939

High · published October 14, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
28.5
In the wild
Unconfirmed
What it is

Description

NGINX Ingress Controller has a vulnerability when implementing an externalAuth policy for ingress. NGINX Ingress Controller may mishandle the HTTP response from an OAuth IdP and allow an attacker to acquire unauthenticated access to protected paths before the proper external authentication can happen.

Impact

This vulnerability may allow remote attackers

unauthenticated

access to protected

paths. There is no control plane exposure; this is a data plane issue only.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS
0.00359 · 28.5th percentile
Weakness
CWE-303 · Incorrect Implementation of Authentication Algorithm
Published
2026-10-14T19:17Z
References (1)
https://my.f5.com/manage/s/article/K000162617 · [email protected]
EPSS history
Timeline
  • 16 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 14 OCT 14:40Z
    NGINX Ingress Controller vulnerability
    cvelistv5
  • 14 OCT 14:40Z
    NGINX Ingress Controller vulnerability
    cvelistv5