Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching in pathmatcher

Description

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.

Scores

EPSS (exploitation in 30 days)

0.46% · top 60% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.1.

Weakness

• CWE-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization (opens in a new tab)All about CWE-551 and its CVEs
• CWE-178 Improper Handling of Case Sensitivity (opens in a new tab)All about CWE-178 and its CVEs

Affected products

• Red Hat · Red Hat build of Keycloak 26.4

  • unaffected 26.4.14-1 – < *

• Red Hat · Red Hat build of Keycloak 26.4

  • unaffected 26.4-22 – < *

• Red Hat · Red Hat build of Keycloak 26.4

  • unaffected 26.4-22 – < *

• Red Hat · Red Hat build of Keycloak 26.4.14

  All versions: unaffected

• Red Hat · Red Hat build of Keycloak 26.4.14

  All versions: unaffected

• Red Hat · Red Hat build of Keycloak 26.6

  • unaffected 26.6.5-1 – < *

• Red Hat · Red Hat build of Keycloak 26.6

  • unaffected 26.6-11 – < *

• Red Hat · Red Hat build of Keycloak 26.6

  • unaffected 26.6-11 – < *

• Red Hat · Red Hat build of Keycloak 26.6.5

  All versions: unaffected

• Red Hat · Red Hat build of Keycloak 26.6.5

  All versions: unaffected

• Red Hat · Red Hat build of Keycloak 26.6.5

  All versions: unaffected

• Red Hat · Red Hat Data Grid 8

  All versions: affected

• Red Hat · Red Hat JBoss Enterprise Application Platform Expansion Pack

  All versions: unaffected

• Red Hat · Red Hat Single Sign-On 7

  All versions: affected

References (6)

• RHSA-2026:50846 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• RHSA-2026:50847 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• RHSA-2026:50848 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• RHSA-2026:50849 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/security/cve/CVE-2026-15573 (opens in a new tab)vdb-entryx_refsource_REDHAT
• RHBZ#2499593 (opens in a new tab)issue-trackingx_refsource_REDHAT

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-15573](https://trackcve.app/badge/CVE-2026-15573.svg)](https://trackcve.app/cve/CVE-2026-15573)

Record last updated 31 Aug 2026, 09:43 UTC.