Vulnerability-Lookup

CVE-2026-9689 (GCVE-0-2026-9689)

Vulnerability from cvelistv5 – Published: 2026-05-27 10:35 – Updated: 2026-08-20 00:54

Title

Keycloak: org.keycloak.protocol.oidc: http parameter pollution in oidc redirect uri allows response parameter duplication - #ghi-604

Summary

A flaw was found in Keycloak, an open-source identity and access management solution. When a client application is configured to accept broad redirect Uniform Resource Identifiers (URIs), a remote attacker can manipulate the authentication process by crafting a special web address. If a user clicks this link, the client application might incorrectly prioritize attacker-controlled information over legitimate data. This vulnerability, known as HTTP parameter pollution, could allow an attacker to bypass security measures or gain unauthorized access to resources.

Severity

4.2 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-27 14:45 UTC

CWE

CWE-1288 - Improper Validation of Consistency within Input

Assigner

redhat CNA under the redhat root

CNA scorecard B 82/100 over 1081 records in the last 180 days details

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-2026-9689	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2481845	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

2026-05-27 10:18

Credits

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

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-9689

Vulnerability from fkie_nvd - Published: 2026-05-27 12:17 - Updated: 2026-10-26 11:10

Severity

4.2 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/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-2026-9689	Vendor Advisory
secalert@redhat.com	https://bugzilla.redhat.com/show_bug.cgi?id=2481845	Issue Tracking, Vendor Advisory

Impacted products

	Vendor	Product	Version
	redhat	build_of_keycloak	-

JSON

To clipboard

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GHSA-WCVJ-VPVW-9RR5

Vulnerability from github – Published: 2026-05-27 12:31 – Updated: 2026-08-05 18:31

Summary

Keycloak Services has Improper Validation of Consistency within Input

Details

Severity

4.2 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.keycloak:keycloak-services"
      },
      "ranges": [
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          "events": [
            {
              "introduced": "26.5.0"
            },
            {
              "last_affected": "26.6.4"
            }
          ],
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        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.keycloak:keycloak-services"
      },
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            },
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        }
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  ],
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  "database_specific": {
    "cwe_ids": [
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    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-01T18:54:49Z",
    "nvd_published_at": "2026-05-27T12:17:15Z",
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  },
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  "id": "GHSA-wcvj-vpvw-9rr5",
  "modified": "2026-08-05T18:31:20Z",
  "published": "2026-05-27T12:31:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9689"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/issues/49430"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/pull/49959"
    },
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      "url": "https://github.com/keycloak/keycloak/commit/18832bcae5bebd5a1d66c2ec5fcd640e576fa625"
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RHSA-2026:50846

Vulnerability from csaf_redhat - Published: 2026-08-05 16:17 - Updated: 2026-11-01 00:14

Summary

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

Severity

Important

Scope

26 vulnerabilities in this advisory, including CVE-2026-9689.

CVE-2026-9689

4.2 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/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: 2026-11-01 00:14

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-2026-9689.

CVE-2026-9689

4.2 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/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: 2026-11-01 00:14

Summary

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

Severity

Important

Scope

29 vulnerabilities in this advisory, including CVE-2026-9689.

CVE-2026-9689

4.2 (Medium)


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

Fixed: 1 product

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

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RHSA-2026:50849

Vulnerability from csaf_redhat - Published: 2026-08-05 16:20 - Updated: 2026-11-01 00:14

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-2026-9689.

CVE-2026-9689

4.2 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/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: 2026-08-05 22:00

Summary

Keycloak: Mehrere Schwachstellen

Severity

Mittel

Scope

12 vulnerabilities in this advisory, including CVE-2026-9689.

CVE-2026-9689

Known affected: 4 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.

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-2026-9689 (GCVE-0-2026-9689)

FKIE_CVE-2026-9689

GHSA-WCVJ-VPVW-9RR5

RHSA-2026:50846

RHSA-2026:50847

RHSA-2026:50848

RHSA-2026:50849

WID-SEC-W-2026-1708

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour