What’s Vulnerable › Vulnerabilities
CVE-2026-24513: ingress-nginx auth-url protection bypass
- Severity: low (CVSS 3.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-02-03 · updated 2026-06-17
- Weakness: CWE-754
Description
A security issue was discovered in ingress-nginx where the protection afforded by the `auth-url` Ingress annotation may not be effective in the presence of a specific misconfiguration. If the ingress-nginx controller is configured with a default custom-errors configuration that includes HTTP errors 401 or 403, and if the configured default custom-errors backend is defective and fails to respect the X-Code HTTP header, then an Ingress with the `auth-url` annotation may be accessed even when authentication fails. Note that the built-in custom-errors backend works correctly. To trigger this issue requires an administrator to specifically configure ingress-nginx with a broken external component.
Affected products
- Kubernetes ingress-nginx: before 1.13.7; before 1.14.3 — fixed in 1.13.7, 1.14.3
How to fix
Upgrade to a fixed version: Kubernetes ingress-nginx 1.13.7, 1.14.3. Check the vendor advisory for mitigations.
References
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