Vulnerability-Lookup

CVE-2026-15573 (GCVE-0-2026-15573)

Vulnerability from cvelistv5 – Published: 2026-08-05 13:50 – Updated: 2026-08-31 09:43

Title

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

Summary

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.

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-05 19:33 UTC

CWE

CWE-551 - Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
CWE-178 - Improper Handling of Case Sensitivity

Assigner

redhat redhat root

References

6 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:50846	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:50847	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:50848	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:50849	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-15573	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2499593	issue-trackingx_refsource_REDHAT

Impacted products

9 products

Vendor	Product	Version
Red Hat	Red Hat build of Keycloak 26.4	Unaffected: 26.4.14-1 , < * (rpm) cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat	Red Hat build of Keycloak 26.4	Unaffected: 26.4-22 , < * (rpm) cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat	Red Hat build of Keycloak 26.4.14	cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat	Red Hat build of Keycloak 26.6	Unaffected: 26.6.5-1 , < * (rpm) cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat	Red Hat build of Keycloak 26.6	Unaffected: 26.6-11 , < * (rpm) cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat	Red Hat build of Keycloak 26.6.5	cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat	Red Hat Data Grid 8	cpe:/a:redhat:jboss_data_grid:8
Red Hat	Red Hat JBoss Enterprise Application Platform Expansion Pack	cpe:/a:redhat:jbosseapxp
Red Hat	Red Hat Single Sign-On 7	cpe:/a:redhat:red_hat_single_sign_on:7

Date Public

2026-08-05 02:02

Credits

Red Hat would like to thank Sanil Dulal for reporting this issue.

Show details on NVD website

JSON

To clipboard

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bit-keycloak-2026-15573

Vulnerability from bitnami_vulndb

Published

2026-08-25 11:41

Modified

2026-09-08 08:34

Summary

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

Details

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "keycloak",
        "purl": "pkg:bitnami/keycloak"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "26.4.0"
            },
            {
              "fixed": "26.4.14"
            },
            {
              "introduced": "26.6.0"
            },
            {
              "fixed": "26.6.5"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-15573"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*",
      "cpe:2.3:a:keycloak:keycloak:*:*:*:*:*:*:*:*"
    ],
    "severity": "High"
  },
  "details": "A flaw was found in Keycloak\u0027s 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.",
  "id": "BIT-keycloak-2026-15573",
  "modified": "2026-09-08T08:34:36.952Z",
  "published": "2026-08-25T11:41:39.364Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:50846"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:50847"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:50848"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:50849"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/CVE-2026-15573"
    },
    {
      "type": "ADVISORY",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2499593"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-15573"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching in pathmatcher"
}

CERTFR-2026-AVI-0976

Vulnerability from certfr_avis - Published: 2026-08-06 - Updated: 2026-08-06

De multiples vulnérabilités ont été découvertes dans KeyCloak. Certaines d'entre elles permettent à un attaquant de provoquer une élévation de privilèges, un déni de service à distance et une atteinte à la confidentialité des données.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

Vendor	Product	Description
Keycloak	Keycloak	Keycloak versions 26.7.x antérieures à 26.7.1
Keycloak	Keycloak	Keycloak versions antérieures à 26.4.14
Keycloak	Keycloak	Keycloak versions 26.6.x antérieures à 26.6.5

References

Title

Publication Time

FKIE_CVE-2026-15573

Vulnerability from fkie_nvd - Published: 2026-08-05 15:16 - Updated: 2026-08-31 10:16

Severity

8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Summary

References

URL	Tags
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:50846	Vendor Advisory
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:50847	Vendor Advisory
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:50848	Vendor Advisory
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:50849	Vendor Advisory
secalert@redhat.com	https://access.redhat.com/security/cve/CVE-2026-15573	Vendor Advisory
secalert@redhat.com	https://bugzilla.redhat.com/show_bug.cgi?id=2499593	Issue Tracking, Vendor Advisory

Impacted products

Vendor	Product	Version
redhat	build_of_keycloak	*
redhat	build_of_keycloak	*
redhat	data_grid	8.0
redhat	jboss_enterprise_application_platform_expansion_pack	-
redhat	single_sign-on	7.0

JSON

To clipboard

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          "vendor": "Red Hat"
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          "cpes": [
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          ],
          "defaultStatus": "affected",
          "packageName": "keycloak-services",
          "product": "Red Hat Data Grid 8",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
          "cpes": [
            "cpe:/a:redhat:jbosseapxp"
          ],
          "defaultStatus": "unaffected",
          "packageName": "keycloak-services",
          "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:red_hat_single_sign_on:7"
          ],
          "defaultStatus": "affected",
          "packageName": "keycloak-services",
          "product": "Red Hat Single Sign-On 7",
          "vendor": "Red Hat"
        }
      ],
      "source": "secalert@redhat.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
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              "criteria": "cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "26.4.14",
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              "matchCriteriaId": "7095200A-4DAC-4433-99E8-86CA88E1E4D4",
              "vulnerable": true
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              "matchCriteriaId": "0A24CBFB-4900-47A5-88D2-A44C929603DC",
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      "lang": "en",
      "value": "A flaw was found in Keycloak\u0027s 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."
    }
  ],
  "id": "CVE-2026-15573",
  "lastModified": "2026-08-31T10:16:48.890",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
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        "source": "secalert@redhat.com",
        "type": "Secondary"
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        "ssvcData": {
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          "options": [
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            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-05T19:33:09.755039Z",
          "version": "2.0.3"
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      "tags": [
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      ],
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    },
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    },
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      "source": "secalert@redhat.com",
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    },
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    },
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      "source": "secalert@redhat.com",
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      "type": "Secondary"
    }
  ]
}

GHSA-6J7G-HR6V-3HXC

Vulnerability from github – Published: 2026-08-05 15:32 – Updated: 2026-08-05 18:31

Details

Severity

8.1 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-15573"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-178",
      "CWE-551"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-05T15:16:36Z",
    "severity": "HIGH"
  },
  "details": "A flaw was found in Keycloak\u0027s 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.",
  "id": "GHSA-6j7g-hr6v-3hxc",
  "modified": "2026-08-05T18:31:34Z",
  "published": "2026-08-05T15:32:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-15573"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:50846"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:50847"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:50848"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:50849"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-15573"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2499593"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

RHSA-2026:50846

Vulnerability from csaf_redhat - Published: 2026-08-05 16:17 - Updated: 2026-09-16 18:13

Summary

Red Hat Security Advisory: Red Hat build of Keycloak 26.4.14 Security Update

Severity

Important

Scope

17 vulnerabilities in this advisory, including CVE-2026-15573.

CVE-2026-15573

8.1 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Fixed: 1 product

https://access.redhat.com/errata/RHSA-2026:50846

Open the full advisory

RHSA-2026:50847

Vulnerability from csaf_redhat - Published: 2026-08-05 16:20 - Updated: 2026-09-16 18:13

Summary

Red Hat Security Advisory: Red Hat build of Keycloak 26.4.14 Images Security Update

Severity

Important

Scope

17 vulnerabilities in this advisory, including CVE-2026-15573.

CVE-2026-15573

8.1 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Fixed: 9 products

https://access.redhat.com/errata/RHSA-2026:50847

Open the full advisory

RHSA-2026:50848

Vulnerability from csaf_redhat - Published: 2026-08-05 16:17 - Updated: 2026-09-16 18:13

Summary

Red Hat Security Advisory: Red Hat build of Keycloak 26.6.5 Security Update

Severity

Important

Scope

19 vulnerabilities in this advisory, including CVE-2026-15573.

CVE-2026-15573

8.1 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Fixed: 1 product

https://access.redhat.com/errata/RHSA-2026:50848

Open the full advisory

RHSA-2026:50849

Vulnerability from csaf_redhat - Published: 2026-08-05 16:20 - Updated: 2026-09-16 18:15

Summary

Red Hat Security Advisory: Red Hat build of Keycloak 26.6.5 Images Security Update

Severity

Important

Scope

19 vulnerabilities in this advisory, including CVE-2026-15573.

CVE-2026-15573

8.1 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Fixed: 9 products

https://access.redhat.com/errata/RHSA-2026:50849

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-15573 (GCVE-0-2026-15573)

Vulnerability from bitnami_vulndb

Solutions

Tags

Sightings

Nomenclature

Related by attack behaviour