Paper/Archive/CVE-2026-11861

CVE-2026-11861

Red Hat Red Hat Enterprise Linux 10 — Freeipa: idm: ipa: freeipa: obtaining tgs with impersonating cname through trust relationships

EPSS 0.4%CVSS 9.6

critical.is priorityof 100

CVSS 9.6 (CNA)9.6 / 10 × 3028.8 Not in CISA KEV+300.0 EPSS percentile 28.5.285 × 205.7 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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

ProductAffectedFixed inSource

Red Hat Enterprise Linux 10see advisory0:4.13.4-1.el10_2CNA

Red Hat Enterprise Linux 10.0 Extended Update Supportsee advisory0:4.12.2-15.el10_0.7CNA

Red Hat Enterprise Linux 8see advisory8100020261007071200.143e9e98CNA

Red Hat Enterprise Linux 8see advisory8100020261007070536.823393f5CNA

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportsee advisory8060020261008134123.c1533a64CNA

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportsee advisory8060020261008133528.ada582f1CNA

Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-Onsee advisory8060020261008134123.c1533a64CNA

Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-Onsee advisory8060020261008133528.ada582f1CNA

Red Hat Enterprise Linux 8.8 Telecommunications Update Servicesee advisory8080020261007080925.e581a9e4CNA

Red Hat Enterprise Linux 8.8 Telecommunications Update Servicesee advisory8080020261007071832.b0a6ceeaCNA

Red Hat Enterprise Linux 8.8 Update Services for SAP Solutionssee advisory8080020261007080925.e581a9e4CNA

Red Hat Enterprise Linux 8.8 Update Services for SAP Solutionssee advisory8080020261007071832.b0a6ceeaCNA

Scores by source

redhat (CNA)9.6CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References