Vulnerability-Lookup

CVE-2026-8830 (GCVE-0-2026-8830)

Vulnerability from cvelistv5 – Published: 2026-05-19 06:04 – Updated: 2026-06-26 06:46

Title

Keycloak: org.keycloak/keycloak-services: keycloak: policy bypass during webauthn credential registration via client-side javascript manipulation

Summary

A flaw was found in Keycloak. An authenticated user can bypass configured WebAuthn policies during credential registration by manipulating client-side JavaScript. This occurs because the server-side processAction() fails to validate that the newly created credential's parameters, such as public key algorithms, match the realm's configured WebAuthn policies. This could lead to the creation of credentials that do not adhere to administrative security requirements, potentially weakening the overall security posture of the system by allowing non-compliant authentication methods.

Severity

4.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-19 16:31 UTC

CWE

CWE-603 - Use of Client-Side Authentication

Assigner

redhat redhat root

References

6 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:25097	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25098	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30049	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30050	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-8830	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2479565	issue-trackingx_refsource_REDHAT

Impacted products

6 products

Vendor	Product	Version
Red Hat	Red Hat build of Keycloak 26.4	Unaffected: 26.4.13-1 , < * (rpm) cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat	Red Hat build of Keycloak 26.4	Unaffected: 26.4-19 , < * (rpm) cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat	Red Hat build of Keycloak 26.4.13	cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat	Red Hat build of Keycloak 26.6	Unaffected: 26.6.3-3 , < * (rpm) cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat	Red Hat build of Keycloak 26.6	Unaffected: 26.6-6 , < * (rpm) cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat	Red Hat build of Keycloak 26.6.3	cpe:/a:redhat:build_keycloak:26.6::el9

Date Public

2026-05-19 05:00

Credits

Red Hat would like to thank Martin Bartoš (RedHat) for reporting this issue.

Show details on NVD website

JSON

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}

FKIE_CVE-2026-8830

Vulnerability from fkie_nvd - Published: 2026-05-19 07:16 - Updated: 2026-07-23 20:10

Severity

4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Summary

References

URL	Tags
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:25097
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:25098
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:30049
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:30050
secalert@redhat.com	https://access.redhat.com/security/cve/CVE-2026-8830	Vendor Advisory
secalert@redhat.com	https://bugzilla.redhat.com/show_bug.cgi?id=2479565	Issue Tracking, Vendor Advisory

Impacted products

	Vendor	Product	Version
	redhat	build_of_keycloak	-

JSON

To clipboard

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      "affectedData": [
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          "packageName": "rhbk/keycloak-rhel9-operator",
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  "configurations": [
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  ],
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  "lastModified": "2026-07-23T20:10:00.130",
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          "attackComplexity": "LOW",
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          "privilegesRequired": "LOW",
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          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
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          "role": "CISA Coordinator",
          "timestamp": "2026-05-19T16:31:58.175835Z",
          "version": "2.0.3"
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      "source": "secalert@redhat.com",
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}

GHSA-G8VR-X4QH-25QG

Vulnerability from github – Published: 2026-05-19 09:31 – Updated: 2026-06-26 09:30

Summary

Keycloak: Policy bypass during WebAuthn credential registration via client-side JavaScript manipulation

Details

Severity

4.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 26.6.2"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.keycloak:keycloak-services"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.6.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-8830"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-603"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-04T17:28:15Z",
    "nvd_published_at": "2026-05-19T07:16:30Z",
    "severity": "MODERATE"
  },
  "details": "A flaw was found in Keycloak. An authenticated user can bypass configured WebAuthn policies during credential registration by manipulating client-side JavaScript. This occurs because the server-side processAction() fails to validate that the newly created credential\u0027s parameters, such as public key algorithms, match the realm\u0027s configured WebAuthn policies. This could lead to the creation of credentials that do not adhere to administrative security requirements, potentially weakening the overall security posture of the system by allowing non-compliant authentication methods.",
  "id": "GHSA-g8vr-x4qh-25qg",
  "modified": "2026-06-26T09:30:45Z",
  "published": "2026-05-19T09:31:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8830"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/issues/49133"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/pull/49344"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/commit/47b9aef70948564151af85fd52e0d7e508c76490"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/commit/d3da77ef363d698e7a74470ba52fcdce09e394c4"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:25097"
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    {
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      "url": "https://access.redhat.com/errata/RHSA-2026:25098"
    },
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      "url": "https://access.redhat.com/errata/RHSA-2026:30050"
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    {
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    },
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      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479565"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/keycloak/keycloak"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Keycloak: Policy bypass during WebAuthn credential registration via client-side JavaScript manipulation"
}

RHSA-2026:25097

Vulnerability from csaf_redhat - Published: 2026-06-10 17:35 - Updated: 2026-08-04 10:44

Summary

Red Hat Security Advisory: Red Hat build of Keycloak 26.6.3 Images Update

Severity

Moderate

Scope

14 vulnerabilities in this advisory, including CVE-2026-8830.

CVE-2026-8830

4.3 (Medium)


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

Fixed: 9 products

https://access.redhat.com/errata/RHSA-2026:25097

Open the full advisory

RHSA-2026:25098

Vulnerability from csaf_redhat - Published: 2026-06-10 17:38 - Updated: 2026-08-27 01:55

Summary

Red Hat Security Advisory: Red Hat build of Keycloak 26.6.3 Update

Severity

Moderate

Scope

14 vulnerabilities in this advisory, including CVE-2026-8830.

CVE-2026-8830

4.3 (Medium)


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

Fixed: 1 product

https://access.redhat.com/errata/RHSA-2026:25098

Open the full advisory

RHSA-2026:30049

Vulnerability from csaf_redhat - Published: 2026-06-25 17:36 - Updated: 2026-09-13 00:09

Summary

Red Hat Security Advisory: Red Hat build of Keycloak 26.4.13 Security Update

Severity

Important

Scope

22 vulnerabilities in this advisory, including CVE-2026-8830.

CVE-2026-8830

4.3 (Medium)


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

Fixed: 1 product

https://access.redhat.com/errata/RHSA-2026:30049

Open the full advisory

RHSA-2026:30050

Vulnerability from csaf_redhat - Published: 2026-06-25 17:40 - Updated: 2026-09-13 00:09

Summary

Red Hat Security Advisory: Red Hat build of Keycloak 26.4.13 Images Security Update

Severity

Important

Scope

22 vulnerabilities in this advisory, including CVE-2026-8830.

CVE-2026-8830

4.3 (Medium)


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

Fixed: 9 products

https://access.redhat.com/errata/RHSA-2026:30050

Open the full advisory

WID-SEC-W-2026-1573

Vulnerability from csaf_certbund - Published: 2026-05-18 22:00 - Updated: 2026-06-10 22:00

Summary

Keycloak: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen

Severity

Mittel

Scope

1 vulnerability in this advisory, including CVE-2026-8830.

CVE-2026-8830

Known affected: 3 products

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.

Action not permitted

CVE-2026-8830 (GCVE-0-2026-8830)

FKIE_CVE-2026-8830

GHSA-G8VR-X4QH-25QG

RHSA-2026:25097

RHSA-2026:25098

RHSA-2026:30049

RHSA-2026:30050

WID-SEC-W-2026-1573

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