SEPTEMBER 19, 2026
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Case File

CVE-2026-18211

MEDIUM · CVSS 4.2 EPSS 0.18%

Source: NVD + CISA KEV + EPSS · Published 2026-07-31 · Last synced 2026-08-30

CyberRota Analysis

AI-Generated

A vulnerability exists in the secure-client-uris policy executor of Keycloak core services, which improperly verifies hostnames, allowing attackers to bypass security requirements for client configurations. This flaw could enable interception of sensitive authentication codes through unencrypted connections, posing a risk to applications relying on Keycloak for authentication. Organizations using Keycloak should prioritize addressing this vulnerability to safeguard their authentication processes and protect sensitive user data.

CVE
CVE-2026-18211
Severity
MEDIUM
CVSS
4.2
EPSS
0.18%

Original NVD Description

A flaw was found in the secure-client-uris client policy executor within Keycloak core services. This component is responsible for enforcing security requirements on client configurations, such as requiring encrypted connections for redirect URIs. Due to an improper check that only looks at the start of a web address rather than properly verifying the host, an attacker can bypass these security restrictions by using a specially crafted domain name. This could allow an attacker to intercept sensitive authentication codes over unencrypted connections.

Related CVEs

Other vulnerabilities affecting the same vendor(s)