Vulnerability-Lookup

CVE-2026-9086 (GCVE-0-2026-9086)

Vulnerability from cvelistv5 – Published: 2026-06-25 16:16 – Updated: 2026-07-15 00:38

Title

Keycloak: keycloak: cross-site scripting (xss) via case-insensitive uri validation bypass

Summary

A flaw was found in Keycloak. A remote attacker with administrative privileges, specifically those with `manage-client` permission or access to client registration endpoints, could bypass client Uniform Resource Identifier (URI) validation. This is achieved by registering a malicious client with a specially crafted redirect URI using a case-insensitive `javascript:` or `data:` scheme. This Cross-Site Scripting (XSS) vulnerability allows for arbitrary code execution in the Keycloak origin when a victim clicks the crafted link, such as in the logout flow or the Admin Console.

Severity

7.3 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:R/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 2026-06-25 17:59 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

redhat redhat root

References

7 references

URL	Tags
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/errata/RHSA-2026:30083	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30084	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-9086	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2480170	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex

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: 26.6.4-2 , < * (rpm) cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat	Red Hat build of Keycloak 26.6	Unaffected: 26.6-8 , < * (rpm) cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat	Red Hat build of Keycloak 26.6.4	cpe:/a:redhat:build_keycloak:26.6::el9

Date Public

2026-06-25 15:58

Credits

Red Hat would like to thank saku0512 for reporting this issue.

Show details on NVD website

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}

bit-keycloak-2026-9086

Vulnerability from bitnami_vulndb

Published

2026-08-25 11:42

Modified

2026-09-08 08:34

Summary

Keycloak: keycloak: cross-site scripting (xss) via case-insensitive uri validation bypass

Details

A flaw was found in Keycloak. A remote attacker with administrative privileges, specifically those with manage-client permission or access to client registration endpoints, could bypass client Uniform Resource Identifier (URI) validation. This is achieved by registering a malicious client with a specially crafted redirect URI using a case-insensitive javascript: or data: scheme. This Cross-Site Scripting (XSS) vulnerability allows for arbitrary code execution in the Keycloak origin when a victim clicks the crafted link, such as in the logout flow or the Admin Console.

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "keycloak",
        "purl": "pkg:bitnami/keycloak"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "26.4.0"
            },
            {
              "fixed": "26.4.13"
            },
            {
              "introduced": "26.6.0"
            },
            {
              "fixed": "26.6.4"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-9086"
  ],
  "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. A remote attacker with administrative privileges, specifically those with `manage-client` permission or access to client registration endpoints, could bypass client Uniform Resource Identifier (URI) validation. This is achieved by registering a malicious client with a specially crafted redirect URI using a case-insensitive `javascript:` or `data:` scheme. This Cross-Site Scripting (XSS) vulnerability allows for arbitrary code execution in the Keycloak origin when a victim clicks the crafted link, such as in the logout flow or the Admin Console.",
  "id": "BIT-keycloak-2026-9086",
  "modified": "2026-09-08T08:34:36.952Z",
  "published": "2026-08-25T11:42:40.305Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:30049"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:30050"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:30083"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:30084"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/CVE-2026-9086"
    },
    {
      "type": "ADVISORY",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480170"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9086"
    },
    {
      "type": "ADVISORY",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9086.json"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Keycloak: keycloak: cross-site scripting (xss) via case-insensitive uri validation bypass"
}

CERTFR-2026-AVI-0815

Vulnerability from certfr_avis - Published: 2026-06-29 - Updated: 2026-06-29

De multiples vulnérabilités ont été découvertes dans KeyCloak. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, une élévation de privilèges 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 26.6.x antérieures à 26.6.4
	Keycloak	Keycloak	Keycloak versions 26.0.x antérieures à 26.0.10

References

Title

Publication Time

FKIE_CVE-2026-9086

Vulnerability from fkie_nvd - Published: 2026-06-25 17:17 - Updated: 2026-07-15 01:17

Severity

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

Summary

References

URL	Tags
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:30049	Third Party Advisory
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:30050	Third Party Advisory
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:30083	Third Party Advisory
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:30084	Third Party Advisory
secalert@redhat.com	https://access.redhat.com/security/cve/CVE-2026-9086	Third Party Advisory
secalert@redhat.com	https://bugzilla.redhat.com/show_bug.cgi?id=2480170	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:30049	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:30050	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:30083	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:30084	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-9086	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2480170	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9086.json	Third Party Advisory

Impacted products

	Vendor	Product	Version
	redhat	build_of_keycloak	*
	redhat	build_of_keycloak	*

JSON

To clipboard

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          "timestamp": "2026-06-25T17:59:48.293762Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-25T17:17:03.147",
  "references": [
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://access.redhat.com/errata/RHSA-2026:30049"
    },
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Third Party Advisory"
      ],
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    },
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://access.redhat.com/errata/RHSA-2026:30083"
    },
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://access.redhat.com/errata/RHSA-2026:30084"
    },
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://access.redhat.com/security/cve/CVE-2026-9086"
    },
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480170"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://access.redhat.com/errata/RHSA-2026:30049"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://access.redhat.com/errata/RHSA-2026:30050"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://access.redhat.com/errata/RHSA-2026:30083"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://access.redhat.com/errata/RHSA-2026:30084"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "tags": [
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      ],
      "url": "https://access.redhat.com/security/cve/CVE-2026-9086"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "tags": [
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    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "value": "CWE-79"
        }
      ],
      "source": "secalert@redhat.com",
      "type": "Secondary"
    },
    {
      "description": [
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          "lang": "en",
          "value": "CWE-79"
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      ],
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "type": "Secondary"
    }
  ]
}

GHSA-37J9-56GH-J2R7

Vulnerability from github – Published: 2026-06-25 18:30 – Updated: 2026-06-30 03:37

Details

Severity

7.3 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-9086"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-25T17:17:03Z",
    "severity": "HIGH"
  },
  "details": "A flaw was found in Keycloak. A remote attacker with administrative privileges, specifically those with `manage-client` permission or access to client registration endpoints, could bypass client Uniform Resource Identifier (URI) validation. This is achieved by registering a malicious client with a specially crafted redirect URI using a case-insensitive `javascript:` or `data:` scheme. This Cross-Site Scripting (XSS) vulnerability allows for arbitrary code execution in the Keycloak origin when a victim clicks the crafted link, such as in the logout flow or the Admin Console.",
  "id": "GHSA-37j9-56gh-j2r7",
  "modified": "2026-06-30T03:37:13Z",
  "published": "2026-06-25T18:30:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9086"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:30049"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:30050"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:30083"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:30084"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-9086"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480170"
    },
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9086.json"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

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-2026-9086.

CVE-2026-9086

7.3 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/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-2026-9086.

CVE-2026-9086

7.3 (High)


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

Fixed: 9 products

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

Open the full advisory

RHSA-2026:30083

Vulnerability from csaf_redhat - Published: 2026-06-25 18:47 - Updated: 2026-09-13 00:09

Summary

Red Hat Security Advisory: Red Hat build of Keycloak 26.6.4 Security Update

Severity

Important

Scope

9 vulnerabilities in this advisory, including CVE-2026-9086.

CVE-2026-9086

7.3 (High)


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

Fixed: 1 product

https://access.redhat.com/errata/RHSA-2026:30083

Open the full advisory

RHSA-2026:30084

Vulnerability from csaf_redhat - Published: 2026-06-25 18:50 - Updated: 2026-09-13 00:09

Summary

Red Hat Security Advisory: Red Hat build of Keycloak 26.6.4 Images Security Update

Severity

Important

Scope

9 vulnerabilities in this advisory, including CVE-2026-9086.

CVE-2026-9086

7.3 (High)


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

Fixed: 9 products

https://access.redhat.com/errata/RHSA-2026:30084

Open the full advisory

WID-SEC-W-2026-2093

Vulnerability from csaf_certbund - Published: 2026-06-25 22:00 - Updated: 2026-08-05 22:00

Summary

Keycloak: Mehrere Schwachstellen

Severity

Hoch

Scope

7 vulnerabilities in this advisory, including CVE-2026-9086.

CVE-2026-9086

Known affected: 2 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-2026-9086 (GCVE-0-2026-9086)

Vulnerability from bitnami_vulndb

Solutions

Tags

Sightings

Nomenclature

Related by attack behaviour