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CVE-2026-42998

OpenStack Keystone doesn't verify that the user supplied in the authentication request matches the owner of the application credential

6.0 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
Low

Exploit likelihood

0.30%Up 0.2 points since May 29, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.0

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.

Record
CVE-2026-42998
CVSS 3.1
6.0 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
Weakness
CWE-863
Updated
2026-11-02
EUVDEUVD-2026-33240 6.0

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.

Record
EUVD-2026-33240
CVSS 3.1
6.0 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-8f8m-wrvr-wcvf 6.0

OpenStack Keystone doesn't verify that the user supplied in the authentication request matches the owner of the application credential

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.

Record
GHSA-8f8m-wrvr-wcvf
CVSS 3.1
6.0 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
Weakness
CWE-863
Updated
2026-11-02
NVD 6.0

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.

Record
CVE-2026-42998
CVSS 3.1
6.0 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-863
Updated
2026-11-02
OSV 6.0

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.

Record
CVE-2026-42998
CVSS 3.1
6.0 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
Weakness
CWE-863
Updated
2026-11-02
OSVDEBIAN-CVE-2026-42998 8.8

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.

Record
DEBIAN-CVE-2026-42998
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVGHSA-8f8m-wrvr-wcvf 6.0

OpenStack Keystone doesn't verify that the user supplied in the authentication request matches the owner of the application credential

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.

Record
GHSA-8f8m-wrvr-wcvf
CVSS 3.1
6.0 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
Weakness
CWE-863
Updated
2026-11-02
OSVPYSEC-2026-599 8.8

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.

Record
PYSEC-2026-599
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-42998 6.0

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.

Record
UBUNTU-CVE-2026-42998
CVSS 3.1
6.0 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
keystone
PyPI
14.0.0 up to 27.0.2
27.0.2
keystone
PyPI
28.0.0 up to 28.0.2
28.0.2
keystone
PyPI
29.0.0 up to 29.0.2
29.0.2
keystone
Debian:12
before 2:22.0.2-0+deb12u3, plus listed versions
2:22.0.0-22:22.0.2-0+deb12u12:22.0.2-0+deb12u2
2:22.0.2-0+deb12u3
keystone
Debian:13
before 2:27.0.0-3+deb13u4, plus listed versions
2:27.0.0-32:27.0.0-3+deb13u12:27.0.0-3+deb13u3
2:27.0.0-3+deb13u4
keystone
Debian:14
before 2:29.0.1-2, plus listed versions
2:27.0.0-32:28.0.0-12:28.0.0-22:28.0.0-32:28.0.0-4
Show 11 moreShow less
2:28.0.0-52:28.0.0-62:28.0.0~rc1-12:28.0.0~rc1-22:28.0.0~rc1-42:29.0.0-12:29.0.0-22:29.0.0-32:29.0.0~rc1-12:29.0.0~rc1-22:29.0.1-1
2:29.0.1-2
keystone
PyPI
14.0.0 up to 27.0.2, plus listed versions
14.0.114.1.014.2.015.0.015.0.0.0rc1
Show 44 moreShow less
15.0.0.0rc215.0.116.0.016.0.0.0rc116.0.0.0rc216.0.116.0.217.0.017.0.0.0rc117.0.0.0rc217.0.118.0.018.0.0.0rc118.1.019.0.019.0.0.0rc119.0.0.0rc219.0.120.0.020.0.0.0rc120.0.121.0.021.0.0.0rc121.0.122.0.022.0.0.0rc122.0.122.0.223.0.023.0.0.0rc123.0.123.0.224.0.024.0.0.0rc124.1.025.0.025.0.0.0rc126.0.026.0.0.0rc126.1.026.1.127.0.027.0.0.0rc127.0.1
27.0.2
keystone
PyPI
28.0.0 up to 28.0.2, plus listed versions
28.0.1
28.0.2
keystone
PyPI
29.0.0 up to 29.0.2, plus listed versions
29.0.1
29.0.2
keystone
PyPI
14.0.0 up to 27.0.2, 28.0.0 up to 28.0.2, 29.0.0 up to 29.0.2, plus listed versions
14.0.114.1.014.2.015.0.015.0.0.0rc1
Show 45 moreShow less
15.0.0.0rc215.0.116.0.016.0.0.0rc116.0.0.0rc216.0.116.0.217.0.017.0.0.0rc117.0.0.0rc217.0.118.0.018.0.0.0rc118.1.019.0.019.0.0.0rc119.0.0.0rc219.0.120.0.020.0.0.0rc120.0.121.0.021.0.0.0rc121.0.122.0.022.0.0.0rc122.0.122.0.223.0.023.0.0.0rc123.0.123.0.224.0.024.0.0.0rc124.1.025.0.025.0.0.0rc126.0.026.0.0.0rc126.1.026.1.127.0.027.0.0.0rc127.0.128.0.1
27.0.228.0.229.0.2
Show 7 moreShow less
Affected packages
PackageAffectedFixed
keystone
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
2:8.0.0-0ubuntu12:9.0.0~b1-0ubuntu12:9.0.0~b2-0ubuntu12:9.0.0~b3-0ubuntu12:9.0.0~rc1-0ubuntu1
Show 11 moreShow less
2:9.0.0-0ubuntu12:9.0.2-0ubuntu12:9.0.2-0ubuntu22:9.1.0-0ubuntu12:9.2.0-0ubuntu12:9.3.0-0ubuntu12:9.3.0-0ubuntu22:9.3.0-0ubuntu32:9.3.0-0ubuntu3.12:9.3.0-0ubuntu3.22:9.3.0-0ubuntu3.2+esm2
None known
keystone
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
2:12.0.0-0ubuntu12:13.0.0~b1-0ubuntu12:13.0.0~b2-0ubuntu12:13.0.0~b3-0ubuntu12:13.0.0~rc1-0ubuntu1
Show 7 moreShow less
2:13.0.0~rc2-0ubuntu12:13.0.0-0ubuntu12:13.0.1-0ubuntu12:13.0.2-0ubuntu12:13.0.2-0ubuntu32:13.0.4-0ubuntu12:13.0.4-0ubuntu1+esm1
None known
keystone
Ubuntu:Pro:20.04:LTS
All versions, plus listed versions
2:16.0.0-0ubuntu12:17.0.0~b1~git2019121613.db81fee63-0ubuntu12:17.0.0~b2~git2020020513.99733f172-0ubuntu12:17.0.0~b3~git2020032415.9f9040257-0ubuntu12:17.0.0~b3~git2020032415.9f9040257-0ubuntu2
Show 6 moreShow less
2:17.0.0~b3~git2020041013.7bb6314e4-0ubuntu12:17.0.0-0ubuntu0.20.04.12:17.0.1-0ubuntu12:17.0.1-0ubuntu22:17.0.1-0ubuntu2+esm12:17.0.1-0ubuntu2+esm2
None known
keystone
Ubuntu:22.04:LTS
before 2:21.0.1-0ubuntu2.4, plus listed versions
2:20.0.0-0ubuntu12:20.0.0+git2021120815.2ddf8f321-0ubuntu12:20.0.0+git2022011217.771c943ad-0ubuntu12:20.0.0+git2022030313.a3fc9e7c3-0ubuntu12:21.0.0-0ubuntu1
Show 4 moreShow less
2:21.0.1-0ubuntu12:21.0.1-0ubuntu22:21.0.1-0ubuntu2.12:21.0.1-0ubuntu2.2
2:21.0.1-0ubuntu2.4
keystone
Ubuntu:24.04:LTS
before 2:25.0.0-0ubuntu1.4, plus listed versions
2:24.0.0-0ubuntu12:24.0.0+git2024011916.adfa92b4-0ubuntu12:25.0.0~rc1-0ubuntu12:25.0.0-0ubuntu12:25.0.0-0ubuntu1.12:25.0.0-0ubuntu1.2
2:25.0.0-0ubuntu1.4
keystone
Ubuntu:25.10
before 2:28.0.0-0ubuntu1.3, plus listed versions
2:27.0.0-0ubuntu12:27.0.0+git2025080113.e066e18ab-0ubuntu12:28.0.0~rc1-0ubuntu12:28.0.0-0ubuntu12:28.0.0-0ubuntu1.1
2:28.0.0-0ubuntu1.3
keystone
Ubuntu:26.04:LTS
before 2:29.0.0-0ubuntu1.2, plus listed versions
2:28.0.0-0ubuntu12:28.0.0-0ubuntu22:28.0.0+git20260119.61.8a42793e7-0ubuntu12:29.0.0~rc1-0ubuntu12:29.0.0-0ubuntu1
2:29.0.0-0ubuntu1.2

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-42998 is a medium vulnerability (CVSS 6.0) in Openstack Keystone, published May 28, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.30%, the 23rd percentile. Fixed in keystone 27.0.2.

References

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