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ubuntu-cve-2026-42998
Vulnerability from osv_ubuntu
Published
2026-05-28 19:16
Modified
2026-06-17 00:05
Summary
Details

An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone application credential authentication plugin does not verify that the user supplied in the authentication request matches the owner of the application credential. An attacker can authenticate with their own application credential ID and secret while specifying a different user's name and domain in the request body. Keystone issues a token attributed to the victim user. The impersonated token is project-scoped and carries the intersection of the application credential's roles and the victim's actual roles on the project. This enables audit evasion, reading the victim's credentials, and acting as the victim within shared projects.

Severity
6.0 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "keystone",
            "binary_version": "2:9.3.0-0ubuntu3.2"
          },
          {
            "binary_name": "python-keystone",
            "binary_version": "2:9.3.0-0ubuntu3.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "keystone",
        "purl": "pkg:deb/ubuntu/keystone@2:9.3.0-0ubuntu3.2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:8.0.0-0ubuntu1",
        "2:9.0.0~b1-0ubuntu1",
        "2:9.0.0~b2-0ubuntu1",
        "2:9.0.0~b3-0ubuntu1",
        "2:9.0.0~rc1-0ubuntu1",
        "2:9.0.0-0ubuntu1",
        "2:9.0.2-0ubuntu1",
        "2:9.0.2-0ubuntu2",
        "2:9.1.0-0ubuntu1",
        "2:9.2.0-0ubuntu1",
        "2:9.3.0-0ubuntu1",
        "2:9.3.0-0ubuntu2",
        "2:9.3.0-0ubuntu3",
        "2:9.3.0-0ubuntu3.1",
        "2:9.3.0-0ubuntu3.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "keystone",
            "binary_version": "2:13.0.4-0ubuntu1"
          },
          {
            "binary_name": "python-keystone",
            "binary_version": "2:13.0.4-0ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "keystone",
        "purl": "pkg:deb/ubuntu/keystone@2:13.0.4-0ubuntu1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:12.0.0-0ubuntu1",
        "2:13.0.0~b1-0ubuntu1",
        "2:13.0.0~b2-0ubuntu1",
        "2:13.0.0~b3-0ubuntu1",
        "2:13.0.0~rc1-0ubuntu1",
        "2:13.0.0~rc2-0ubuntu1",
        "2:13.0.0-0ubuntu1",
        "2:13.0.1-0ubuntu1",
        "2:13.0.2-0ubuntu1",
        "2:13.0.2-0ubuntu3",
        "2:13.0.4-0ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "keystone",
            "binary_version": "2:17.0.1-0ubuntu2+esm1"
          },
          {
            "binary_name": "keystone-common",
            "binary_version": "2:17.0.1-0ubuntu2+esm1"
          },
          {
            "binary_name": "python3-keystone",
            "binary_version": "2:17.0.1-0ubuntu2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "keystone",
        "purl": "pkg:deb/ubuntu/keystone@2:17.0.1-0ubuntu2+esm1?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:16.0.0-0ubuntu1",
        "2:17.0.0~b1~git2019121613.db81fee63-0ubuntu1",
        "2:17.0.0~b2~git2020020513.99733f172-0ubuntu1",
        "2:17.0.0~b3~git2020032415.9f9040257-0ubuntu1",
        "2:17.0.0~b3~git2020032415.9f9040257-0ubuntu2",
        "2:17.0.0~b3~git2020041013.7bb6314e4-0ubuntu1",
        "2:17.0.0-0ubuntu0.20.04.1",
        "2:17.0.1-0ubuntu1",
        "2:17.0.1-0ubuntu2",
        "2:17.0.1-0ubuntu2+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "keystone",
            "binary_version": "2:21.0.1-0ubuntu2.4"
          },
          {
            "binary_name": "keystone-common",
            "binary_version": "2:21.0.1-0ubuntu2.4"
          },
          {
            "binary_name": "python3-keystone",
            "binary_version": "2:21.0.1-0ubuntu2.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "keystone",
        "purl": "pkg:deb/ubuntu/keystone@2:21.0.1-0ubuntu2.4?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:21.0.1-0ubuntu2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:20.0.0-0ubuntu1",
        "2:20.0.0+git2021120815.2ddf8f321-0ubuntu1",
        "2:20.0.0+git2022011217.771c943ad-0ubuntu1",
        "2:20.0.0+git2022030313.a3fc9e7c3-0ubuntu1",
        "2:21.0.0-0ubuntu1",
        "2:21.0.1-0ubuntu1",
        "2:21.0.1-0ubuntu2",
        "2:21.0.1-0ubuntu2.1",
        "2:21.0.1-0ubuntu2.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "keystone",
            "binary_version": "2:25.0.0-0ubuntu1.4"
          },
          {
            "binary_name": "keystone-common",
            "binary_version": "2:25.0.0-0ubuntu1.4"
          },
          {
            "binary_name": "python3-keystone",
            "binary_version": "2:25.0.0-0ubuntu1.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "keystone",
        "purl": "pkg:deb/ubuntu/keystone@2:25.0.0-0ubuntu1.4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:25.0.0-0ubuntu1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:24.0.0-0ubuntu1",
        "2:24.0.0+git2024011916.adfa92b4-0ubuntu1",
        "2:25.0.0~rc1-0ubuntu1",
        "2:25.0.0-0ubuntu1",
        "2:25.0.0-0ubuntu1.1",
        "2:25.0.0-0ubuntu1.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "keystone",
            "binary_version": "2:28.0.0-0ubuntu1.3"
          },
          {
            "binary_name": "keystone-common",
            "binary_version": "2:28.0.0-0ubuntu1.3"
          },
          {
            "binary_name": "python3-keystone",
            "binary_version": "2:28.0.0-0ubuntu1.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "keystone",
        "purl": "pkg:deb/ubuntu/keystone@2:28.0.0-0ubuntu1.3?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:28.0.0-0ubuntu1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:27.0.0-0ubuntu1",
        "2:27.0.0+git2025080113.e066e18ab-0ubuntu1",
        "2:28.0.0~rc1-0ubuntu1",
        "2:28.0.0-0ubuntu1",
        "2:28.0.0-0ubuntu1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "keystone",
            "binary_version": "2:29.0.0-0ubuntu1.2"
          },
          {
            "binary_name": "keystone-common",
            "binary_version": "2:29.0.0-0ubuntu1.2"
          },
          {
            "binary_name": "python3-keystone",
            "binary_version": "2:29.0.0-0ubuntu1.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "keystone",
        "purl": "pkg:deb/ubuntu/keystone@2:29.0.0-0ubuntu1.2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:29.0.0-0ubuntu1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:28.0.0-0ubuntu1",
        "2:28.0.0-0ubuntu2",
        "2:28.0.0+git20260119.61.8a42793e7-0ubuntu1",
        "2:29.0.0~rc1-0ubuntu1",
        "2:29.0.0-0ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone application credential authentication plugin does not verify that the user supplied in the authentication request matches the owner of the application credential. An attacker can authenticate with their own application credential ID and secret while specifying a different user\u0027s name and domain in the request body. Keystone issues a token attributed to the victim user. The impersonated token is project-scoped and carries the intersection of the application credential\u0027s roles and the victim\u0027s actual roles on the project. This enables audit evasion, reading the victim\u0027s credentials, and acting as the victim within shared projects.",
  "id": "UBUNTU-CVE-2026-42998",
  "modified": "2026-06-17T00:05:14Z",
  "published": "2026-05-28T19:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-42998"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-42998"
    },
    {
      "type": "REPORT",
      "url": "https://bugs.launchpad.net/keystone/+bug/2148477"
    },
    {
      "type": "REPORT",
      "url": "https://security.openstack.org/ossa/OSSA-2026-015.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8433-1"
    }
  ],
  "related": [
    "USN-8433-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-42998"
  ]
}



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