GHSA-HCVW-475W-8G7P

Vulnerability from github – Published: 2026-02-09 21:31 – Updated: 2026-02-13 20:32
VLAI
Summary
Keycloak affected by improper invitation token validation
Details

A flaw was found in Keycloak. An attacker can exploit this vulnerability by modifying the organization ID and target email within a legitimate invitation token's JSON Web Token (JWT) payload. This lack of cryptographic signature verification allows the attacker to successfully self-register into an unauthorized organization, leading to unauthorized access.

Severity
8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.keycloak:keycloak-services"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "26.5.0"
            },
            {
              "fixed": "26.5.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.keycloak:keycloak-services"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.2.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.keycloak:keycloak-services"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "26.3.0"
            },
            {
              "fixed": "26.4.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-1529"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-10T18:35:20Z",
    "nvd_published_at": "2026-02-09T20:15:55Z",
    "severity": "HIGH"
  },
  "details": "A flaw was found in Keycloak. An attacker can exploit this vulnerability by modifying the organization ID and target email within a legitimate invitation token\u0027s JSON Web Token (JWT) payload. This lack of cryptographic signature verification allows the attacker to successfully self-register into an unauthorized organization, leading to unauthorized access.",
  "id": "GHSA-hcvw-475w-8g7p",
  "modified": "2026-02-13T20:32:01Z",
  "published": "2026-02-09T21:31:03Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-1529"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/issues/46145"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/pull/46155"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/commit/82cd7941d1dd28fa14a67a6e6b912301f1a5e1a1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/commit/8fc9a98026106a326f4faa98d4c9a48341ace2d7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/commit/b2519756487b519f95c07aa8b10afe003e492119"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:2363"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:2364"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:2365"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:2366"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-1529"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2433783"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/keycloak/keycloak"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Keycloak affected by improper invitation token validation"
}



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