CVE-2026-15571 (GCVE-0-2026-15571)

Vulnerability from cvelistv5 – Published: 2026-08-18 20:40 – Updated: 2026-08-20 14:07
VLAI
Title
Keycloak-services: keycloak-services: predictable account-linking hash enables account takeover via malicious oidc client
Summary
A flaw was found in the legacy client-initiated account-linking endpoint of Keycloak, a widely used open-source identity and access management solution. The mechanism used to protect the account-linking process from unauthorized requests relies on a hash that can be predicted by a malicious OIDC client. By tricking a user into authenticating, an attacker-controlled client can forge a valid linking URL to connect the victim's account to an attacker's external identity. This results in a full account takeover, allowing the attacker to log in as the victim.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 14:06 UTC
CWE
  • CWE-341 - Predictable from Observable State
References
URL Tags
https://access.redhat.com/errata/RHSA-2026:56523 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:56524 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-15571 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2499591 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version CPE status
Red Hat Red Hat build of Keycloak 26.6 Unaffected: 26.6.6-1 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.6::el9
Create a notification for this product.
Red Hat Red Hat build of Keycloak 26.6 Unaffected: 26.6-12 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.6::el9
Create a notification for this product.
Red Hat Red Hat build of Keycloak 26.6.6     cpe:/a:redhat:build_keycloak:26.6
Create a notification for this product.
Red Hat Red Hat Data Grid 8     cpe:/a:redhat:jboss_data_grid:8
Create a notification for this product.
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack     cpe:/a:redhat:jbosseapxp
Create a notification for this product.
Red Hat Red Hat Single Sign-On 7     cpe:/a:redhat:red_hat_single_sign_on:7
Create a notification for this product.
Date Public
2026-08-18 19:41
Show details on NVD website

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              "defaultStatus": "unaffected",
              "packageName": "keycloak-services",
              "product": "Red Hat Single Sign-On 7",
              "vendor": "Red Hat"
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              "lang": "en",
              "value": "Red Hat would like to thank yd1ng for reporting this issue."
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          ],
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          "descriptions": [
            {
              "lang": "en",
              "value": "A flaw was found in the legacy client-initiated account-linking endpoint of Keycloak, a widely used open-source identity and access management solution. The mechanism used to protect the account-linking process from unauthorized requests relies on a hash that can be predicted by a malicious OIDC client. By tricking a user into authenticating, an attacker-controlled client can forge a valid linking URL to connect the victim\u0027s account to an attacker\u0027s external identity. This results in a full account takeover, allowing the attacker to log in as the victim."
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
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                "scope": "UNCHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N",
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              "name": "RHSA-2026:56524",
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              "url": "https://access.redhat.com/security/cve/CVE-2026-15571"
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              "name": "RHBZ#2499591",
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          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2026-07-07T18:49:21.000Z",
              "value": "Reported to Red Hat."
            },
            {
              "lang": "en",
              "time": "2026-08-18T19:41:18.051Z",
              "value": "Made public."
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          ],
          "title": "Keycloak-services: keycloak-services: predictable account-linking hash enables account takeover via malicious oidc client",
          "x_generator": {
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          },
          "x_redhatCweChain": "CWE-341: Predictable from Observable State"
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      "cveMetadata": {
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        "datePublished": "2026-08-18T20:40:17.770Z",
        "dateReserved": "2026-07-13T07:12:45.061Z",
        "dateUpdated": "2026-08-20T14:07:09.247Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.

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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.


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