Vulnerability-Lookup

CVE-2026-9087 (GCVE-0-2026-9087)

Vulnerability from cvelistv5 – Published: 2026-05-20 16:13 – Updated: 2026-08-03 10:41

Title

Keycloak: cross-session email verification proof not bound to upstream identity in first-broker-login

Summary

A flaw was found in Keycloak. The cross-session verification proof is keyed only by (local userId, idpAlias) and is not bound to the upstream identity that was actually verified, so a second upstream account on the same IdP can consume it and get linked to the victim's local account.

Severity

6.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/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 2026-05-21 14:01 UTC

CWE

CWE-639 - Authorization Bypass Through User-Controlled Key

Assigner

redhat CNA under the redhat root

CNA scorecard B 82/100 over 1185 records in the last 180 days details

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-2026-9087	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2480172	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

2026-05-20 14:53

Credits

Red Hat would like to thank Emilio Galle for reporting this issue.

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2026-9087

Vulnerability from fkie_nvd - Published: 2026-05-20 17:16 - Updated: 2026-07-23 12:10

Severity

6.4 (Medium) - CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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-2026-9087	Vendor Advisory
secalert@redhat.com	https://bugzilla.redhat.com/show_bug.cgi?id=2480172	Issue Tracking, Vendor Advisory

Impacted products

	Vendor	Product	Version
	redhat	build_of_keycloak	-

JSON

To clipboard

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    },
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  ],
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  "lastModified": "2026-07-23T12:10:00.110",
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        "type": "Secondary"
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          "timestamp": "2026-05-21T14:01:27.979329Z",
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}

GHSA-M6QJ-3MPP-57V8

Vulnerability from github – Published: 2026-05-20 18:31 – Updated: 2026-06-26 09:30

Summary

Keycloak: Insufficient verification proof scoping enables identity provider account linking attack and account compromise

Details

Severity

6.4 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.keycloak:keycloak-services"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.6.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-9087"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-639"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-11T16:40:55Z",
    "nvd_published_at": "2026-05-20T17:16:32Z",
    "severity": "MODERATE"
  },
  "details": "A flaw was found in Keycloak. The cross-session verification proof is keyed only by (local userId,\nidpAlias) and is not bound to the upstream identity that was actually verified, so a second upstream account on the same IdP can consume it and get linked to the victim\u0027s local account.",
  "id": "GHSA-m6qj-3mpp-57v8",
  "modified": "2026-06-26T09:30:45Z",
  "published": "2026-05-20T18:31:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9087"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/commit/37dabf59d0b5ca3e5b3b272bcd3b2580e67b94dd"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:25097"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:25098"
    },
    {
      "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/security/cve/CVE-2026-9087"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480172"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/keycloak/keycloak"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/releases/tag/26.6.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Keycloak: Insufficient verification proof scoping enables identity provider account linking attack and account compromise"
}

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-2026-9087.

CVE-2026-9087

6.4 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/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-2026-9087.

CVE-2026-9087

6.4 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/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: 2026-11-05 19:31

Summary

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

Severity

Important

Scope

36 vulnerabilities in this advisory, including CVE-2026-9087.

CVE-2026-9087

6.4 (Medium)


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

Fixed: 1 product

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

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RHSA-2026:30050

Vulnerability from csaf_redhat - Published: 2026-06-25 17:40 - Updated: 2026-11-05 21:17

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-2026-9087.

CVE-2026-9087

6.4 (Medium)


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

Fixed: 9 products

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

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WID-SEC-W-2026-1616

Vulnerability from csaf_certbund - Published: 2026-05-20 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-2026-9087.

CVE-2026-9087

Known affected: 3 products

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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

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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-2026-9087 (GCVE-0-2026-9087)

FKIE_CVE-2026-9087

GHSA-M6QJ-3MPP-57V8

RHSA-2026:25097

RHSA-2026:25098

RHSA-2026:30049

RHSA-2026:30050

WID-SEC-W-2026-1616

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour