Vulnerability-Lookup

CVE-2026-9798 (GCVE-0-2026-9798)

Vulnerability from cvelistv5 – Published: 2026-05-28 04:37 – Updated: 2026-08-20 00:54

Title

Keycloak: keycloak: brute-force protection bypass in ciba flow

Summary

A flaw was found in Keycloak, an open-source identity and access management solution. When a user account is temporarily locked due to repeated failed login attempts, an attacker with valid client credentials can exploit the Client-Initiated Backchannel Authentication (CIBA) flow to bypass this brute-force protection. This allows continued authentication attempts and token issuance even when the account should be locked, potentially enabling further unauthorized access attempts.

Severity

4.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-29 18:29 UTC

CWE

CWE-305 - Authentication Bypass by Primary Weakness

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-2026-9798	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2482470	issue-trackingx_refsource_REDHAT

Impacted products

6 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

Date Public

2026-05-28 03:53

Credits

Red Hat would like to thank Evan Hendra (Independent Security Researcher) for reporting this issue.

Show details on NVD website

JSON

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This allows continued authentication attempts and token issuance even when the account should be locked, potentially enabling further unauthorized access attempts.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-305\", \"description\": \"Authentication Bypass by Primary Weakness\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2026-08-20T00:54:21.784Z\"}, \"x_redhatCweChain\": \"CWE-305: Authentication Bypass by Primary Weakness\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-9798\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-20T00:54:21.784Z\", \"dateReserved\": \"2026-05-28T03:51:03.615Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2026-05-28T04:37:09.472Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-9798

Vulnerability from fkie_nvd - Published: 2026-05-28 06:16 - Updated: 2026-08-20 01:16

Severity

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

Summary

References

URL	Tags
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:50846
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:50847
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:50848
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:50849
secalert@redhat.com	https://access.redhat.com/security/cve/CVE-2026-9798	Mitigation, Vendor Advisory
secalert@redhat.com	https://bugzilla.redhat.com/show_bug.cgi?id=2482470	Issue Tracking, Vendor Advisory

Impacted products

	Vendor	Product	Version
	redhat	build_of_keycloak	-

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "cpes": [
            "cpe:/a:redhat:build_keycloak:26.4::el9"
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          "defaultStatus": "affected",
          "packageName": "rhbk/keycloak-operator-bundle",
          "product": "Red Hat build of Keycloak 26.4",
          "vendor": "Red Hat",
          "versions": [
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              "status": "unaffected",
              "version": "26.4.14-1",
              "versionType": "rpm"
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          "cpes": [
            "cpe:/a:redhat:build_keycloak:26.4::el9"
          ],
          "defaultStatus": "affected",
          "packageName": "rhbk/keycloak-rhel9",
          "product": "Red Hat build of Keycloak 26.4",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "26.4-22",
              "versionType": "rpm"
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              "status": "unaffected",
              "version": "26.4-22",
              "versionType": "rpm"
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          ]
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        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:build_keycloak:26.4::el9"
          ],
          "defaultStatus": "unaffected",
          "packageName": "rhbk/keycloak-rhel9",
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          "packageName": "rhbk/keycloak-operator-bundle",
          "product": "Red Hat build of Keycloak 26.6",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "26.6.5-1",
              "versionType": "rpm"
            }
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        },
        {
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "cpes": [
            "cpe:/a:redhat:build_keycloak:26.6::el9"
          ],
          "defaultStatus": "affected",
          "packageName": "rhbk/keycloak-rhel9",
          "product": "Red Hat build of Keycloak 26.6",
          "vendor": "Red Hat",
          "versions": [
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              "lessThan": "*",
              "status": "unaffected",
              "version": "26.6-11",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "cpes": [
            "cpe:/a:redhat:build_keycloak:26.6::el9"
          ],
          "defaultStatus": "affected",
          "packageName": "rhbk/keycloak-rhel9-operator",
          "product": "Red Hat build of Keycloak 26.6",
          "vendor": "Red Hat",
          "versions": [
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              "lessThan": "*",
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              "version": "26.6-11",
              "versionType": "rpm"
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          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:build_keycloak:26.6::el9"
          ],
          "defaultStatus": "unaffected",
          "product": "Red Hat build of Keycloak 26.6.5",
          "vendor": "Red Hat"
        }
      ],
      "source": "secalert@redhat.com"
    }
  ],
  "configurations": [
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      "value": "A flaw was found in Keycloak, an open-source identity and access management solution. When a user account is temporarily locked due to repeated failed login attempts, an attacker with valid client credentials can exploit the Client-Initiated Backchannel Authentication (CIBA) flow to bypass this brute-force protection. This allows continued authentication attempts and token issuance even when the account should be locked, potentially enabling further unauthorized access attempts."
    }
  ],
  "id": "CVE-2026-9798",
  "lastModified": "2026-08-20T01:16:54.770",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 1.4,
        "source": "secalert@redhat.com",
        "type": "Secondary"
      }
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          "options": [
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            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-29T18:29:49.249825Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-28T06:16:29.330",
  "references": [
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:50846"
    },
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      "url": "https://access.redhat.com/errata/RHSA-2026:50847"
    },
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      "url": "https://access.redhat.com/errata/RHSA-2026:50848"
    },
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      "url": "https://access.redhat.com/errata/RHSA-2026:50849"
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      "tags": [
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      ],
      "url": "https://access.redhat.com/security/cve/CVE-2026-9798"
    },
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      "source": "secalert@redhat.com",
      "tags": [
        "Issue Tracking",
        "Vendor Advisory"
      ],
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482470"
    }
  ],
  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-305"
        }
      ],
      "source": "secalert@redhat.com",
      "type": "Secondary"
    }
  ]
}

GHSA-Q6H7-XXP7-7429

Vulnerability from github – Published: 2026-05-28 06:31 – Updated: 2026-08-05 18:31

Summary

Keycloak has an Authentication Bypass by Primary Weakness

Details

Severity

4.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.keycloak:keycloak-services"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "26.4.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.keycloak:keycloak-services"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "26.5.0"
            },
            {
              "last_affected": "26.6.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-9798"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-305"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-01T21:26:22Z",
    "nvd_published_at": "2026-05-28T06:16:29Z",
    "severity": "MODERATE"
  },
  "details": "A flaw was found in Keycloak, an open-source identity and access management solution. When a user account is temporarily locked due to repeated failed login attempts, an attacker with valid client credentials can exploit the Client-Initiated Backchannel Authentication (CIBA) flow to bypass this brute-force protection. This allows continued authentication attempts and token issuance even when the account should be locked, potentially enabling further unauthorized access attempts.",
  "id": "GHSA-q6h7-xxp7-7429",
  "modified": "2026-08-05T18:31:21Z",
  "published": "2026-05-28T06:31:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9798"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/issues/49432"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/pull/49791"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/pull/49903"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/pull/49905"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/commit/11c2695064cd93da1d333df3f69d4a4141e86c29"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/commit/2edc6b112e2dedce63062b89ab3c7ae542e0d9ac"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/commit/a11e3254efc16ae72ce5092b93b9f557a4ba43ae"
    },
    {
      "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-2026-9798"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482470"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/keycloak/keycloak"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Keycloak has an Authentication Bypass by Primary Weakness"
}

RHSA-2026:50846

Vulnerability from csaf_redhat - Published: 2026-08-05 16:17 - Updated: 2026-09-13 00:09

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-2026-9798.

CVE-2026-9798

4.3 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/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: 2026-09-13 00:09

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-2026-9798.

CVE-2026-9798

4.3 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/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: 2026-09-13 00:09

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-2026-9798.

CVE-2026-9798

4.3 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/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: 2026-09-13 00:09

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-2026-9798.

CVE-2026-9798

4.3 (Medium)


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

Fixed: 9 products

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

Open the full advisory

WID-SEC-W-2026-1708

Vulnerability from csaf_certbund - Published: 2026-05-27 22:00 - Updated: 2026-06-10 22:00

Summary

Keycloak: Mehrere Schwachstellen

Severity

Mittel

Scope

12 vulnerabilities in this advisory, including CVE-2026-9798.

CVE-2026-9798

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.
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-2026-9798 (GCVE-0-2026-9798)

FKIE_CVE-2026-9798

GHSA-Q6H7-XXP7-7429

RHSA-2026:50846

RHSA-2026:50847

RHSA-2026:50848

RHSA-2026:50849

WID-SEC-W-2026-1708

Tags

Sightings

Nomenclature

Related by attack behaviour