RHSA-2026:56520

Vulnerability from csaf_redhat - Published: 2026-08-18 20:36 - Updated: 2026-08-19 03:21
Summary
Red Hat Security Advisory: Red Hat build of Keycloak 26.4.15 Security Update
Severity
Critical
Notes
Topic: New Red Hat build of Keycloak 26.4.15 packages are available from the Customer Portal
Details: Red Hat build of Keycloak 26.4.15 is a standalone server, based on the Keycloak project, that provides authentication and standards-based single sign-on capabilities for web and mobile applications. Security fixes: * Unauthenticated account takeover via reset-credentials flow bypass (CVE-2026-18963)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2026-18963

A flaw was found in the reset-credentials flow of the keycloak-services component, which is the core engine for identity and access management in Red Hat Build of Keycloak. The issue allows an unauthenticated attacker to force the password reset process for any user without needing to click the required email verification link. This can result in the attacker gaining full control over target user accounts by directly setting new credentials.

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE-640 - Weak Password Recovery Mechanism for Forgotten Password
Affected products
Product Identifier Version Remediation
Red Hat build of Keycloak 26.4.15
Red Hat / Red Hat build of Keycloak
 cpe:/a:redhat:build_keycloak:26.4 —
Vendor Fix fix
Workaround
Threats
Impact Critical
References
Acknowledgments
James Paremain
To clipboard 

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        "text": "New Red Hat build of Keycloak 26.4.15 packages are available from the Customer Portal",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "Red Hat build of Keycloak 26.4.15 is a standalone server, based on\nthe Keycloak project, that provides authentication and\nstandards-based single sign-on capabilities for web and mobile\napplications.\n\nSecurity fixes:\n* Unauthenticated account takeover via reset-credentials flow bypass (CVE-2026-18963)",
        "title": "Details"
      },
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        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
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          "summary": "Last updated version"
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      "cwe": {
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        "name": "Weak Password Recovery Mechanism for Forgotten Password"
      },
      "discovery_date": "2026-07-31T15:46:15+00:00",
      "ids": [
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          "text": "2511595"
        }
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        {
          "category": "description",
          "text": "A flaw was found in the reset-credentials flow of the keycloak-services component, which is the core engine for identity and access management in Red Hat Build of Keycloak. The issue allows an unauthenticated attacker to force the password reset process for any user without needing to click the required email verification link. This can result in the attacker gaining full control over target user accounts by directly setting new credentials.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "keycloak-services: keycloak-services: Unauthenticated account takeover via reset-credentials flow bypass",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "The Red Hat Product Security team has assessed the severity of this vulnerability as Critical, given that it can be exploited by an unauthenticated remote attacker without any user interaction. Successful exploitation allows an attacker to gain full access to any user account by bypassing the email verification step in the password recovery process. The vulnerability\u0027s root cause is improper state validation within the reset-credentials authentication flow.",
          "title": "Statement"
        },
        {
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        {
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-18963",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-18963"
        },
        {
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          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18963"
        }
      ],
      "release_date": "2026-08-17T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-18T20:36:54+00:00",
          "details": "Before applying the update, back up your existing installation,\nincluding all applications, configuration files, databases and\ndatabase settings, and so on.",
          "product_ids": [
            "Red Hat build of Keycloak 26.4.15"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:56520"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
          "product_ids": [
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        }
      ],
      "scores": [
        {
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Critical"
        }
      ],
      "title": "keycloak-services: keycloak-services: Unauthenticated account takeover via reset-credentials flow bypass"
    }
  ]
}



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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

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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.