UBUNTU-CVE-2026-11861

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-11861
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11861.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-11861
Upstream
Published
2026-08-20T11:16:00Z
Modified
2026-09-02T19:34:37Z
Severity
  • 9.6 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N CVSS Calculator
  • 8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A flaw was found in FreeIPA. When a trust relationship is configured between FreeIPA and Active Directory, Active Directory users can bypass authentication for FreeIPA services, including the portal, SMB server, and LDAP directory. This is possible by impersonating a client name in the Ticket Granting Service (TGS) due to FreeIPA services not verifying Privilege Attribute Certificate (PAC) certificates. This vulnerability could allow an authenticated Active Directory user to escalate their privileges within the FreeIPA domain.

References

Affected packages

Ubuntu:18.04:LTS
freeipa

Package

Name
freeipa
Purl
pkg:deb/ubuntu/freeipa?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.4.4-3ubuntu1
4.4.4-4
4.7.0~pre1+git20180411-2ubuntu1
4.7.0~pre1+git20180411-2ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "freeipa-admintools",
            "binary_version": "4.7.0~pre1+git20180411-2ubuntu2"
        },
        {
            "binary_name": "freeipa-client",
            "binary_version": "4.7.0~pre1+git20180411-2ubuntu2"
        },
        {
            "binary_name": "freeipa-common",
            "binary_version": "4.7.0~pre1+git20180411-2ubuntu2"
        },
        {
            "binary_name": "freeipa-server",
            "binary_version": "4.7.0~pre1+git20180411-2ubuntu2"
        },
        {
            "binary_name": "freeipa-server-dns",
            "binary_version": "4.7.0~pre1+git20180411-2ubuntu2"
        },
        {
            "binary_name": "freeipa-server-trust-ad",
            "binary_version": "4.7.0~pre1+git20180411-2ubuntu2"
        },
        {
            "binary_name": "freeipa-tests",
            "binary_version": "4.7.0~pre1+git20180411-2ubuntu2"
        },
        {
            "binary_name": "python-ipaclient",
            "binary_version": "4.7.0~pre1+git20180411-2ubuntu2"
        },
        {
            "binary_name": "python-ipalib",
            "binary_version": "4.7.0~pre1+git20180411-2ubuntu2"
        },
        {
            "binary_name": "python-ipaserver",
            "binary_version": "4.7.0~pre1+git20180411-2ubuntu2"
        },
        {
            "binary_name": "python-ipatests",
            "binary_version": "4.7.0~pre1+git20180411-2ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11861.json"
Ubuntu:20.04:LTS
freeipa

Package

Name
freeipa
Purl
pkg:deb/ubuntu/freeipa?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.8.1-2ubuntu1
4.8.3-1
4.8.6-1ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "freeipa-client",
            "binary_version": "4.8.6-1ubuntu2"
        },
        {
            "binary_name": "freeipa-client-samba",
            "binary_version": "4.8.6-1ubuntu2"
        },
        {
            "binary_name": "freeipa-common",
            "binary_version": "4.8.6-1ubuntu2"
        },
        {
            "binary_name": "python3-ipaclient",
            "binary_version": "4.8.6-1ubuntu2"
        },
        {
            "binary_name": "python3-ipalib",
            "binary_version": "4.8.6-1ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11861.json"
Ubuntu:22.04:LTS
freeipa

Package

Name
freeipa
Purl
pkg:deb/ubuntu/freeipa?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.8.6-1ubuntu6
4.8.6-1ubuntu8
4.8.6-1ubuntu9
4.9.8-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "freeipa-client",
            "binary_version": "4.9.8-1"
        },
        {
            "binary_name": "freeipa-client-epn",
            "binary_version": "4.9.8-1"
        },
        {
            "binary_name": "freeipa-client-samba",
            "binary_version": "4.9.8-1"
        },
        {
            "binary_name": "freeipa-common",
            "binary_version": "4.9.8-1"
        },
        {
            "binary_name": "python3-ipaclient",
            "binary_version": "4.9.8-1"
        },
        {
            "binary_name": "python3-ipalib",
            "binary_version": "4.9.8-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11861.json"
Ubuntu:24.04:LTS
freeipa

Package

Name
freeipa
Purl
pkg:deb/ubuntu/freeipa?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.10.2-1
4.10.2-2
4.10.2-2ubuntu3
4.11.1-1
4.11.1-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "freeipa-client",
            "binary_version": "4.11.1-2"
        },
        {
            "binary_name": "freeipa-client-epn",
            "binary_version": "4.11.1-2"
        },
        {
            "binary_name": "freeipa-client-samba",
            "binary_version": "4.11.1-2"
        },
        {
            "binary_name": "freeipa-common",
            "binary_version": "4.11.1-2"
        },
        {
            "binary_name": "python3-ipaclient",
            "binary_version": "4.11.1-2"
        },
        {
            "binary_name": "python3-ipalib",
            "binary_version": "4.11.1-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11861.json"
Ubuntu:26.04:LTS
freeipa

Package

Name
freeipa
Purl
pkg:deb/ubuntu/freeipa?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.12.4-1
4.12.4-2
4.13.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "freeipa-client",
            "binary_version": "4.13.1-1"
        },
        {
            "binary_name": "freeipa-client-epn",
            "binary_version": "4.13.1-1"
        },
        {
            "binary_name": "freeipa-client-samba",
            "binary_version": "4.13.1-1"
        },
        {
            "binary_name": "freeipa-common",
            "binary_version": "4.13.1-1"
        },
        {
            "binary_name": "python3-ipaclient",
            "binary_version": "4.13.1-1"
        },
        {
            "binary_name": "python3-ipalib",
            "binary_version": "4.13.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11861.json"
Ubuntu:Pro:14.04:LTS
freeipa

Package

Name
freeipa
Purl
pkg:deb/ubuntu/freeipa?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.2.1-0ubuntu1
3.3.4-0ubuntu1
3.3.4-0ubuntu2
3.3.4-0ubuntu3
3.3.4-0ubuntu3.1
3.3.4-0ubuntu3.1+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "freeipa-client",
            "binary_version": "3.3.4-0ubuntu3.1+esm1"
        },
        {
            "binary_name": "python-freeipa",
            "binary_version": "3.3.4-0ubuntu3.1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11861.json"
Ubuntu:Pro:16.04:LTS
freeipa

Package

Name
freeipa
Purl
pkg:deb/ubuntu/freeipa?arch=source&distro=esm-apps%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.1.4-1
4.3.1-0ubuntu1
4.3.1-0ubuntu1+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "freeipa-admintools",
            "binary_version": "4.3.1-0ubuntu1+esm1"
        },
        {
            "binary_name": "freeipa-client",
            "binary_version": "4.3.1-0ubuntu1+esm1"
        },
        {
            "binary_name": "freeipa-common",
            "binary_version": "4.3.1-0ubuntu1+esm1"
        },
        {
            "binary_name": "freeipa-server",
            "binary_version": "4.3.1-0ubuntu1+esm1"
        },
        {
            "binary_name": "freeipa-server-dns",
            "binary_version": "4.3.1-0ubuntu1+esm1"
        },
        {
            "binary_name": "freeipa-server-trust-ad",
            "binary_version": "4.3.1-0ubuntu1+esm1"
        },
        {
            "binary_name": "freeipa-tests",
            "binary_version": "4.3.1-0ubuntu1+esm1"
        },
        {
            "binary_name": "python-ipaclient",
            "binary_version": "4.3.1-0ubuntu1+esm1"
        },
        {
            "binary_name": "python-ipalib",
            "binary_version": "4.3.1-0ubuntu1+esm1"
        },
        {
            "binary_name": "python-ipaserver",
            "binary_version": "4.3.1-0ubuntu1+esm1"
        },
        {
            "binary_name": "python-ipatests",
            "binary_version": "4.3.1-0ubuntu1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11861.json"