Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Network-reachable URI manipulation requires only a valid low-privilege session; no availability impact described; scope unchanged as impact is bounded to Keycloak itself.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Lifecycle Timeline
2DescriptionCVE.org
A flaw was found in Keycloak's Authorization Services. The component responsible for matching request paths to security policies (PathMatcher) does not properly normalize URIs before comparison. By adding extra characters like a trailing slash or matrix parameters to a URL, an attacker can trick the system into applying a less restrictive security policy than intended. This allows an authenticated user to access administrative or restricted areas they should not have permission to see.
AnalysisAI
URI normalization bypass in Keycloak's Authorization Services PathMatcher allows authenticated low-privilege users to reach administrative or restricted endpoints by appending trailing slashes or matrix parameters to request URIs. Affected deployments include Red Hat Build of Keycloak, Red Hat Single Sign-On 7, Red Hat Data Grid 8, and Red Hat JBoss EAP Expansion Pack. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a valid Keycloak account with at minimum a low-privilege role (confirmed by CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 8.1 (High) is driven by AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N - network-reachable, low-complexity exploitation requiring only a low-privilege authenticated session. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated low-privilege user - for example, a self-registered application user - sends an HTTP request to a restricted administrative endpoint such as '/auth/admin/master/console/' (with trailing slash) or '/auth/admin;param=x/master/console' (with matrix parameter). Keycloak's PathMatcher fails to normalize the URI before policy lookup, matches it against a less restrictive resource policy, and grants access to the admin console or other privileged API surface. … |
| Remediation | Consult the Red Hat security advisory at https://access.redhat.com/security/cve/CVE-2026-15573 for patched package versions across Red Hat Build of Keycloak, Red Hat Single Sign-On 7, Red Hat Data Grid 8, and Red Hat JBoss EAP Expansion Pack - no specific fixed version number was provided in the available intelligence data and inventing one would be misleading. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Within 24 hours, inventory all systems running affected Red Hat products and document current versions. …
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-53381
GHSA-6j7g-hr6v-3hxc