Vulnerability-Lookup

CVE-2026-18571 (GCVE-0-2026-18571)

Vulnerability from cvelistv5 – Published: 2026-08-02 05:18 – Updated: 2026-09-16 18:34

Title

Keycloak-services: keycloak-services: fgap v2 group assignment bypass during user creation

Summary

A flaw was found in the user creation component of Keycloak when Fine-Grained Admin Permissions V2 (FGAP V2) is enabled. This issue allows a sub-administrator with permission to create users to add those users to any group, even groups the sub-administrator is not authorized to manage. This could lead to unauthorized access to sensitive information or elevated privileges for the newly created users.

Severity

6.6 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-03 19:52 UTC

CWE

CWE-862 - Missing Authorization

Assigner

redhat CNA under the redhat root

CNA scorecard B 82/100 over 1062 records in the last 180 days details

References

4 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:68277	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:68278	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-18571	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2509759	issue-trackingx_refsource_REDHAT

Impacted products

6 products

Vendor	Product	Version
Red Hat	Red Hat build of Keycloak 26.6	Unaffected: 26.6.7-3 , < * (rpm) cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat	Red Hat build of Keycloak 26.6	Unaffected: 26.6-20 , < * (rpm) cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat	Red Hat build of Keycloak 26.6.7	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

2026-07-30 10:29

Credits

Red Hat would like to thank robinho11842 for reporting this issue.

Show details on NVD website

JSON

To clipboard

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bit-keycloak-2026-18571

Vulnerability from bitnami_vulndb

Published

2026-08-31 14:37

Modified

2026-09-17 12:08

Summary

Keycloak-services: keycloak-services: fgap v2 group assignment bypass during user creation

Details

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "keycloak",
        "purl": "pkg:bitnami/keycloak"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.7.3"
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          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-18571"
  ],
  "database_specific": {
    "cpes": [
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      "cpe:2.3:a:keycloak:keycloak:*:*:*:*:*:*:*:*"
    ],
    "severity": "High"
  },
  "details": "A flaw was found in the user creation component of Keycloak when Fine-Grained Admin Permissions V2 (FGAP V2) is enabled. This issue allows a sub-administrator with permission to create users to add those users to any group, even groups the sub-administrator is not authorized to manage. This could lead to unauthorized access to sensitive information or elevated privileges for the newly created users.",
  "id": "BIT-keycloak-2026-18571",
  "modified": "2026-09-17T12:08:03.261Z",
  "published": "2026-08-31T14:37:20.018Z",
  "references": [
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      "url": "https://access.redhat.com/security/cve/CVE-2026-18571"
    },
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      "type": "ADVISORY",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2509759"
    },
    {
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    },
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    }
  ],
  "schema_version": "1.6.2",
  "summary": "Keycloak-services: keycloak-services: fgap v2 group assignment bypass during user creation"
}

CLEANSTART-2026-MZ50851 (CVE-2026-18571)

Vulnerability from cleanstart – Published: 2026-09-19 00:41 – Updated: 2026-10-08 14:25 – Source website

Summary

flaw was found in the user creation component of Keycloak when Fine-Grained Admin Permissions V2 (FGAP V2) is enabled

Details

Security vulnerability affects the keycloak package. A flaw was found in the user creation component of Keycloak when Fine-Grained Admin Permissions V2 (FGAP V2) is enabled.

Severity

9.8 (Critical)


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

References

URL

Type

	https://github.com/cleanstart-dev/cleanstart-secu…	ADVISORY
	https://osv.dev/vulnerability/CVE-2026-18571	WEB
	https://nvd.nist.gov/vuln/detail/CVE-2026-18571	WEB

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "keycloak",
        "purl": "pkg:apk/cleanstart/keycloak?arch=noarch"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.7.2-r2"
            }
          ],
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        }
      ]
    }
  ],
  "credits": [],
  "database_specific": {},
  "details": "Security vulnerability affects the keycloak package. A flaw was found in the user creation component of Keycloak when Fine-Grained Admin Permissions V2 (FGAP V2) is enabled.",
  "id": "CLEANSTART-2026-MZ50851",
  "modified": "2026-10-08T14:25:51Z",
  "published": "2026-09-19T00:41:30.041715Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-MZ50851.json"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/CVE-2026-18571"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18571"
    }
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  "related": [],
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      "type": "CVSS_V3"
    }
  ],
  "summary": "flaw was found in the user creation component of Keycloak when Fine-Grained Admin Permissions V2 (FGAP V2) is enabled",
  "upstream": [
    "CVE-2026-18571"
  ]
}

FKIE_CVE-2026-18571

Vulnerability from fkie_nvd - Published: 2026-08-02 06:16 - Updated: 2026-09-16 19:17

Severity

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

Summary

References

URL	Tags
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:68277
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:68278
secalert@redhat.com	https://access.redhat.com/security/cve/CVE-2026-18571	Vendor Advisory
secalert@redhat.com	https://bugzilla.redhat.com/show_bug.cgi?id=2509759	Issue Tracking, Vendor Advisory

Impacted products

	Vendor	Product	Version
	redhat	build_of_keycloak	-

JSON

To clipboard

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GHSA-5VMC-QHFJ-QXC3

Vulnerability from github – Published: 2026-08-02 06:30 – Updated: 2026-09-16 18:31

Details

Severity

6.6 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-18571"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-02T06:16:42Z",
    "severity": "MODERATE"
  },
  "details": "A flaw was found in the user creation component of Keycloak when Fine-Grained Admin Permissions V2 (FGAP V2) is enabled. This issue allows a sub-administrator with permission to create users to add those users to any group, even groups the sub-administrator is not authorized to manage. This could lead to unauthorized access to sensitive information or elevated privileges for the newly created users.",
  "id": "GHSA-5vmc-qhfj-qxc3",
  "modified": "2026-09-16T18:31:19Z",
  "published": "2026-08-02T06:30:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18571"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:68277"
    },
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      "type": "CVSS_V3"
    }
  ]
}

RHSA-2026:68277

Vulnerability from csaf_redhat - Published: 2026-09-16 15:46 - Updated: 2026-10-27 05:13

Summary

Red Hat Security Advisory: Red Hat build of Keycloak 26.6.7 Images Security Update

Severity

Important

Scope

28 vulnerabilities in this advisory, including CVE-2026-18571.

CVE-2026-18571

6.6 (Medium)


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

Fixed: 9 products

https://access.redhat.com/errata/RHSA-2026:68277

Open the full advisory

RHSA-2026:68278

Vulnerability from csaf_redhat - Published: 2026-09-16 15:45 - Updated: 2026-10-27 05:13

Summary

Red Hat Security Advisory: Red Hat build of Keycloak 26.6.7 Security Update

Severity

Important

Scope

28 vulnerabilities in this advisory, including CVE-2026-18571.

CVE-2026-18571

6.6 (Medium)


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

Fixed: 1 product

https://access.redhat.com/errata/RHSA-2026:68278

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WID-SEC-W-2026-2614

Vulnerability from csaf_certbund - Published: 2026-08-02 22:00 - Updated: 2026-08-02 22:00

Summary

Keycloak: Mehrere Schwachstellen

Severity

Mittel

Scope

15 vulnerabilities in this advisory, including CVE-2026-18571.

CVE-2026-18571

Known affected: 1 product

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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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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-2026-18571 (GCVE-0-2026-18571)

bit-keycloak-2026-18571

Vulnerability from bitnami_vulndb

CLEANSTART-2026-MZ50851 (CVE-2026-18571)

FKIE_CVE-2026-18571

GHSA-5VMC-QHFJ-QXC3

RHSA-2026:68277

RHSA-2026:68278

WID-SEC-W-2026-2614

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour