UBUNTU-CVE-2026-11861 (CVE-2026-11861)
Vulnerability from osv_ubuntu – Published: 2026-08-20 11:16 – Updated: 2026-09-02 16:12 – Source website
VLAI
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.
Severity
9.6 (Critical)
8.1 (High)
N/A (UNKNOWN)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "freeipa",
"purl": "pkg:deb/ubuntu/freeipa@3.3.4-0ubuntu3.1+esm1?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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-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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "freeipa",
"purl": "pkg:deb/ubuntu/freeipa@4.3.1-0ubuntu1+esm1?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.1.4-1",
"4.3.1-0ubuntu1",
"4.3.1-0ubuntu1+esm1"
]
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "freeipa",
"purl": "pkg:deb/ubuntu/freeipa@4.7.0~pre1+git20180411-2ubuntu2?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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-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"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "freeipa",
"purl": "pkg:deb/ubuntu/freeipa@4.8.6-1ubuntu2?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.8.1-2ubuntu1",
"4.8.3-1",
"4.8.6-1ubuntu2"
]
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "freeipa",
"purl": "pkg:deb/ubuntu/freeipa@4.9.8-1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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": "4.11.1-2"
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "freeipa",
"purl": "pkg:deb/ubuntu/freeipa@4.11.1-2?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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": "4.13.1-1"
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "freeipa",
"purl": "pkg:deb/ubuntu/freeipa@4.13.1-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.12.4-1",
"4.12.4-2",
"4.13.1-1"
]
}
],
"aliases": [],
"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.",
"id": "UBUNTU-CVE-2026-11861",
"modified": "2026-09-02T16:12:02Z",
"published": "2026-08-20T11:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-11861"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-11861"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-11861"
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
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- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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