Vulnerability-Lookup

CVE-2026-7571 (GCVE-0-2026-7571)

Vulnerability from cvelistv5 – Published: 2026-05-19 11:01 – Updated: 2026-05-20 16:08

Title

Keycloak: keycloak: access token disclosure and implicit flow bypass via forged client data

Summary

A flaw was found in Keycloak. A low-privilege user, with knowledge of user credentials and client ID, can bypass a security control intended to disable the implicit flow in OpenID Connect (OIDC) clients. By manipulating client data during a session restart, an attacker can obtain an access token that should not be available. This vulnerability can also lead to the exposure of these access tokens in server logs, proxy logs, and HTTP Referrer headers, resulting in sensitive information disclosure.

Severity

7.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-19 11:57 UTC

CWE

CWE-472 - External Control of Assumed-Immutable Web Parameter

Assigner

redhat redhat root

References

4 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:19596	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19597	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-7571	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2464263	issue-trackingx_refsource_REDHAT

Impacted products

3 products

Vendor	Product	Version
Red Hat	Red Hat build of Keycloak 26.4	Unaffected: 26.4.12-1 , < * (rpm) cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat	Red Hat build of Keycloak 26.4	Unaffected: 26.4-17 , < * (rpm) cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat	Red Hat build of Keycloak 26.4.12	cpe:/a:redhat:build_keycloak:26.4::el9

Date Public

2026-05-19 10:50

Credits

Red Hat would like to thank Evan Hendra for reporting this issue.

Show details on NVD website

JSON

To clipboard

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bit-keycloak-2026-7571

Vulnerability from bitnami_vulndb

Published

2026-08-25 11:42

Modified

2026-09-08 08:34

Summary

Keycloak: keycloak: access token disclosure and implicit flow bypass via forged client data

Details

JSON

To clipboard

{
  "affected": [
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      "package": {
        "ecosystem": "Bitnami",
        "name": "keycloak",
        "purl": "pkg:bitnami/keycloak"
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          "events": [
            {
              "introduced": "26.4.0"
            },
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            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
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  },
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  "modified": "2026-09-08T08:34:36.952Z",
  "published": "2026-08-25T11:42:36.952Z",
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    {
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      "url": "https://access.redhat.com/errata/RHSA-2026:19596"
    },
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      "url": "https://access.redhat.com/errata/RHSA-2026:19597"
    },
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    },
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    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-7571"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Keycloak: keycloak: access token disclosure and implicit flow bypass via forged client data"
}

FKIE_CVE-2026-7571

Vulnerability from fkie_nvd - Published: 2026-05-19 12:16 - Updated: 2026-06-17 11:02

Severity

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

Summary

References

URL	Tags
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:19596	Vendor Advisory
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:19597	Vendor Advisory
secalert@redhat.com	https://access.redhat.com/security/cve/CVE-2026-7571	Vendor Advisory
secalert@redhat.com	https://bugzilla.redhat.com/show_bug.cgi?id=2464263	Vendor Advisory

Impacted products

	Vendor	Product	Version
	redhat	build_of_keycloak	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
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          "product": "Red Hat build of Keycloak 26.4",
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              "version": "26.4.12-1",
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          "vendor": "Red Hat"
        }
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    }
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  "configurations": [
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          "cpeMatch": [
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              "criteria": "cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "26.4.12",
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    }
  ],
  "id": "CVE-2026-7571",
  "lastModified": "2026-06-17T11:02:36.340",
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    "cvssMetricV31": [
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
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          "baseScore": 7.1,
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
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              "technicalImpact": "partial"
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          "timestamp": "2026-05-19T11:57:40.751926Z",
          "version": "2.0.3"
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      "description": [
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          "value": "CWE-472"
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}

GHSA-HQ3P-W4XV-X7VP

Vulnerability from github – Published: 2026-05-19 12:31 – Updated: 2026-06-04 15:36

Summary

Keycloak: Access token disclosure and implicit flow bypass via forged client data

Details

Severity

7.1 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.keycloak:keycloak-services"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.6.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-7571"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-472"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-04T15:36:36Z",
    "nvd_published_at": "2026-05-19T12:16:19Z",
    "severity": "HIGH"
  },
  "details": "A flaw was found in Keycloak. A low-privilege user, with knowledge of user credentials and client ID, can bypass a security control intended to disable the implicit flow in OpenID Connect (OIDC) clients. By manipulating client data during a session restart, an attacker can obtain an access token that should not be available. This vulnerability can also lead to the exposure of these access tokens in server logs, proxy logs, and HTTP Referrer headers, resulting in sensitive information disclosure.",
  "id": "GHSA-hq3p-w4xv-x7vp",
  "modified": "2026-06-04T15:36:36Z",
  "published": "2026-05-19T12:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-7571"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/issues/49110"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/pull/49120"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/commit/56bbfa3d8abccf39df787ae73e044a75aba1da13"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:19596"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:19597"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-7571"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464263"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/keycloak/keycloak"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/releases/tag/26.6.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Keycloak: Access token disclosure and implicit flow bypass via forged client data"
}

RHSA-2026:19596

Vulnerability from csaf_redhat - Published: 2026-05-20 11:23 - Updated: 2026-09-04 16:25

Summary

Red Hat Security Advisory: Red Hat build of Keycloak 26.4.12 Security Update

Severity

Important

Scope

10 vulnerabilities in this advisory, including CVE-2026-7571.

CVE-2026-7571

7.1 (High)


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

Fixed: 1 product

https://access.redhat.com/errata/RHSA-2026:19596

Open the full advisory

RHSA-2026:19597

Vulnerability from csaf_redhat - Published: 2026-05-20 11:23 - Updated: 2026-08-31 02:00

Summary

Red Hat Security Advisory: Red Hat build of Keycloak 26.4.12 Images Security Update

Severity

Important

Scope

10 vulnerabilities in this advisory, including CVE-2026-7571.

CVE-2026-7571

7.1 (High)


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

Fixed: 9 products

https://access.redhat.com/errata/RHSA-2026:19597

Open the full advisory

WID-SEC-W-2026-1612

Vulnerability from csaf_certbund - Published: 2026-05-19 22:00 - Updated: 2026-05-19 22:00

Summary

Keycloak: Mehrere Schwachstellen

Severity

Hoch

Scope

9 vulnerabilities in this advisory, including CVE-2026-7571.

CVE-2026-7571

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.

Action not permitted

CVE-2026-7571 (GCVE-0-2026-7571)

bit-keycloak-2026-7571

Vulnerability from bitnami_vulndb

FKIE_CVE-2026-7571

GHSA-HQ3P-W4XV-X7VP

RHSA-2026:19596

RHSA-2026:19597

WID-SEC-W-2026-1612

Tags

Sightings

Nomenclature