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CRITICAL

CVE-2026-11861

CVSS v3

9.6

CRITICAL

EPSS Score

0.4 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • bind-dyndb-ldapAlmaLinux:8all versions · fixed in 11.6-6.module_el8.10.0+3980+d78e8e90
  • custodiaAlmaLinux:8all versions · fixed in 0.6.0-3.module_el8.6.0+2881+2f24dc92and 1 other package
  • ipa-clientAlmaLinux:10all versions · fixed in 4.13.4-1.el10_2and 17 other packages
  • ipa-clientAlmaLinux:9all versions · fixed in 4.13.4-1.el9_8and 17 other packages
  • ipa-clientAlmaLinux:8all versions · fixed in 4.9.13-21.module_el8.10.0+4302+2d2000af.3and 14 other packages
  • ipa-healthcheckAlmaLinux:8all versions · fixed in 0.12-6.module_el8.10.0+4036+84b152d9and 1 other package
  • opendnssecAlmaLinux:8all versions · fixed in 2.1.7-2.module_el8.10.0+3980+d78e8e90
  • python3-jwcryptoAlmaLinux:8all versions · fixed in 0.5.0-2.module_el8.10.0+3844+20e075e5

6 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-11861 Red Hat Product Security691 products fixed · 21 known affected

    FreeIPA: idm: ipa: FreeIPA: Obtaining TGS with impersonating cname through trust relationships

    ipa-admintools as a component of Red Hat Enterprise Linux 6 · ipa-client as a component of Red Hat Enterprise Linux 6 · ipa-python as a component of Red Hat Enterprise Linux 6

  • RHSA-2026:83460 Red Hat Product Security166 products fixed

    Red Hat Security Advisory: idm:DL1 security, bug fix, and enhancement update

  • RHSA-2026:83461 Red Hat Product Security187 products fixed

    Red Hat Security Advisory: idm:DL1 security, bug fix, and enhancement update

  • RHSA-2026:83085 Red Hat Product Security49 products fixed

    Red Hat Security Advisory: ipa security, bug fix, and enhancement update

  • RHSA-2026:83084 Red Hat Product Security49 products fixed

    Red Hat Security Advisory: ipa security update

  • RHSA-2026:83083 Red Hat Product Security60 products fixed

    Red Hat Security Advisory: ipa security update

3 more advisories

Full record on NVD

Description

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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Published
2026-08-20
Last Modified
2026-08-20

Frequently asked questions

What is CVE-2026-11861?

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.

Is CVE-2026-11861 actively exploited?

Active exploitation of CVE-2026-11861 has not been confirmed. Its EPSS score was 0.4% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-11861?

CVE-2026-11861 has a CVSS v3 base score of 9.6 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N.

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