CVE-2026-11861: Freeipa: idm: ipa: freeipa: obtaining tgs with impersonating cname through trust relationships

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-20 · updated 2026-10-30
Weakness: CWE-266

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.

Affected products

FreeIPA ipa: before 4.13.3 — fixed in 4.13.3
Red Hat Enterprise Linux: 7.0, 8.0, 9.0, 10.0 (and their updates)
Red Hat Enterprise Linux 10: all versions — fixed in 0:4.13.4-1.el10_2
Red Hat Enterprise Linux 10.0 Extended Update Support: all versions — fixed in 0:4.12.2-15.el10_0.7
Red Hat Enterprise Linux 7 Extended Lifecycle Support: all versions — fixed in 0:4.6.8-5.el7_9.25
Red Hat Enterprise Linux 8: all versions — fixed in 8100020261007071200.143e9e98
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support: all versions — fixed in 8060020261008134123.c1533a64
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On: all versions — fixed in 8060020261008134123.c1533a64
Red Hat Enterprise Linux 8.8 Telecommunications Update Service: all versions — fixed in 8080020261007080925.e581a9e4
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions: all versions — fixed in 8080020261007080925.e581a9e4
Red Hat Enterprise Linux 9: all versions — fixed in 0:4.13.4-1.el9_8
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions: all versions — fixed in 0:4.10.1-12.el9_2.7
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions: all versions — fixed in 0:4.11.0-15.el9_4.9
Red Hat Enterprise Linux 9.6 Extended Update Support: all versions — fixed in 0:4.12.2-14.el9_6.8

How to fix

Upgrade to a fixed version: FreeIPA ipa 4.13.3; Red Hat Enterprise Linux 10 0:4.13.4-1.el10_2; Red Hat Enterprise Linux 10.0 Extended Update Support 0:4.12.2-15.el10_0.7; Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:4.6.8-5.el7_9.25; Red Hat Enterprise Linux 8 8100020261007071200.143e9e98; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 8060020261008134123.c1533a64; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 8060020261008134123.c1533a64; Red Hat Enterprise Linux 8.8 Telecommunications Update Service 8080020261007080925.e581a9e4; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 8080020261007080925.e581a9e4; Red Hat Enterprise Linux 9 0:4.13.4-1.el9_8; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:4.10.1-12.el9_2.7; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:4.11.0-15.el9_4.9. Check the vendor advisory for mitigations.

References

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