Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching in pathmatcher
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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-15573US | — | — | ||
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 befo… | ||||
references
External citations — patches, advisories, analysis.
- https://access.redhat.com/errata/RHSA-2026:50846ADVISORY
- https://access.redhat.com/errata/RHSA-2026:50847ADVISORY
- https://access.redhat.com/errata/RHSA-2026:50848ADVISORY
- https://access.redhat.com/errata/RHSA-2026:50849ADVISORY
- https://access.redhat.com/security/cve/CVE-2026-15573ADVISORY
- https://bugzilla.redhat.com/show_bug.cgi?id=2499593ADVISORY
- https://nvd.nist.gov/vuln/detail/CVE-2026-15573WEB
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