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Keycloak CVE-2026-15573

| EUVDEUVD-2026-53381 HIGH
Improper Handling of Case Sensitivity (CWE-178)
2026-08-05 redhat GHSA-6j7g-hr6v-3hxc
8.1
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
8.1 HIGH
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
vuln.today AI
8.1 HIGH

Network-reachable URI manipulation requires only a valid low-privilege session; no availability impact described; scope unchanged as impact is bounded to Keycloak itself.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Red Hat
8.1 HIGH
qualitative

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

2
Analysis Generated
Aug 05, 2026 - 15:22 vuln.today
CVE Published
Aug 05, 2026 - 13:50 nvd
HIGH 8.1

DescriptionCVE.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

Access
Obtain low-privilege Keycloak account
Delivery
Identify restricted admin endpoint URI
Exploit
Append trailing slash or matrix parameter to URI
Execution
Submit crafted HTTP request to Keycloak
Persist
PathMatcher selects lenient policy
Impact
Access admin or restricted resource

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.

Recommended ActionAI

Within 24 hours, inventory all systems running affected Red Hat products and document current versions. …

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Vendor StatusVendor

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CVE-2026-15573 vulnerability details – vuln.today

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