Vulnerability · Published Aug 20, 2026 · Assigned by redhat

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

Critical 9.6

In plain English

A critical-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.6Critical

Exploit odds (30 days)0.4%top 69.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
AlmaLinux:8	bind-dyndb-ldap	11.6-6.module_el8.10.0+3980+d78e8e90	ALSA-2026:83460
AlmaLinux:8	custodia	0.6.0-3.module_el8.6.0+2881+2f24dc92	ALSA-2026:83460
AlmaLinux:10	ipa-client	4.13.4-1.el10_2	ALSA-2026:72279
AlmaLinux:8	ipa-client	4.9.13-21.module_el8.10.0+4302+2d2000af.3	ALSA-2026:83460
AlmaLinux:9	ipa-client	4.13.4-1.el9_8	ALSA-2026:70564
AlmaLinux:10	ipa-client-common	4.13.4-1.el10_2	ALSA-2026:72279
AlmaLinux:8	ipa-client-common	4.9.13-21.module_el8.10.0+4302+2d2000af.3	ALSA-2026:83460
AlmaLinux:9	ipa-client-common	4.13.4-1.el9_8	ALSA-2026:70564
AlmaLinux:10	ipa-client-encrypted-dns	4.13.4-1.el10_2	ALSA-2026:72279
AlmaLinux:9	ipa-client-encrypted-dns	4.13.4-1.el9_8	ALSA-2026:70564
AlmaLinux:10	ipa-client-epn	4.13.4-1.el10_2	ALSA-2026:72279
AlmaLinux:8	ipa-client-epn	4.9.13-21.module_el8.10.0+4302+2d2000af.3	ALSA-2026:83460
AlmaLinux:9	ipa-client-epn	4.13.4-1.el9_8	ALSA-2026:70564
AlmaLinux:10	ipa-client-samba	4.13.4-1.el10_2	ALSA-2026:72279
AlmaLinux:8	ipa-client-samba	4.9.13-21.module_el8.10.0+4302+2d2000af.3	ALSA-2026:83460
AlmaLinux:9	ipa-client-samba	4.13.4-1.el9_8	ALSA-2026:70564
AlmaLinux:10	ipa-common	4.13.4-1.el10_2	ALSA-2026:72279
AlmaLinux:8	ipa-common	4.9.13-21.module_el8.10.0+4302+2d2000af.3	ALSA-2026:83460
AlmaLinux:9	ipa-common	4.13.4-1.el9_8	ALSA-2026:70564
AlmaLinux:8	ipa-healthcheck	0.12-6.module_el8.10.0+4036+84b152d9	ALSA-2026:83460
AlmaLinux:8	ipa-healthcheck-core	0.12-6.module_el8.10.0+4036+84b152d9	ALSA-2026:83460
AlmaLinux:8	ipa-python-compat	4.9.13-21.module_el8.10.0+4302+2d2000af.3	ALSA-2026:83460
AlmaLinux:10	ipa-selinux	4.13.4-1.el10_2	ALSA-2026:72279
AlmaLinux:8	ipa-selinux	4.9.13-21.module_el8.10.0+4302+2d2000af.3	ALSA-2026:83460
AlmaLinux:9	ipa-selinux	4.13.4-1.el9_8	ALSA-2026:70564
AlmaLinux:10	ipa-selinux-luna	4.13.4-1.el10_2	ALSA-2026:72279
AlmaLinux:9	ipa-selinux-luna	4.13.4-1.el9_8	ALSA-2026:70564
AlmaLinux:10	ipa-selinux-nfast	4.13.4-1.el10_2	ALSA-2026:72279
AlmaLinux:9	ipa-selinux-nfast	4.13.4-1.el9_8	ALSA-2026:70564
AlmaLinux:10	ipa-server	4.13.4-1.el10_2	ALSA-2026:72279
AlmaLinux:8	ipa-server	4.9.13-21.module_el8.10.0+4302+2d2000af.3	ALSA-2026:83460
AlmaLinux:9	ipa-server	4.13.4-1.el9_8	ALSA-2026:70564
AlmaLinux:10	ipa-server-common	4.13.4-1.el10_2	ALSA-2026:72279
AlmaLinux:8	ipa-server-common	4.9.13-21.module_el8.10.0+4302+2d2000af.3	ALSA-2026:83460
AlmaLinux:9	ipa-server-common	4.13.4-1.el9_8	ALSA-2026:70564
AlmaLinux:10	ipa-server-dns	4.13.4-1.el10_2	ALSA-2026:72279
AlmaLinux:8	ipa-server-dns	4.9.13-21.module_el8.10.0+4302+2d2000af.3	ALSA-2026:83460
AlmaLinux:9	ipa-server-dns	4.13.4-1.el9_8	ALSA-2026:70564
AlmaLinux:10	ipa-server-encrypted-dns	4.13.4-1.el10_2	ALSA-2026:72279
AlmaLinux:9	ipa-server-encrypted-dns	4.13.4-1.el9_8	ALSA-2026:70564
AlmaLinux:10	ipa-server-trust-ad	4.13.4-1.el10_2	ALSA-2026:72279
AlmaLinux:8	ipa-server-trust-ad	4.9.13-21.module_el8.10.0+4302+2d2000af.3	ALSA-2026:83460
AlmaLinux:9	ipa-server-trust-ad	4.13.4-1.el9_8	ALSA-2026:70564
AlmaLinux:8	opendnssec	2.1.7-2.module_el8.10.0+3980+d78e8e90	ALSA-2026:83460
AlmaLinux:8	python3-custodia	0.6.0-3.module_el8.6.0+2881+2f24dc92	ALSA-2026:83460
AlmaLinux:10	python3-ipaclient	4.13.4-1.el10_2	ALSA-2026:72279
AlmaLinux:8	python3-ipaclient	4.9.13-21.module_el8.10.0+4302+2d2000af.3	ALSA-2026:83460
AlmaLinux:9	python3-ipaclient	4.13.4-1.el9_8	ALSA-2026:70564
AlmaLinux:10	python3-ipalib	4.13.4-1.el10_2	ALSA-2026:72279
AlmaLinux:8	python3-ipalib	4.9.13-21.module_el8.10.0+4302+2d2000af.3	ALSA-2026:83460
AlmaLinux:9	python3-ipalib	4.13.4-1.el9_8	ALSA-2026:70564
AlmaLinux:10	python3-ipaserver	4.13.4-1.el10_2	ALSA-2026:72279
AlmaLinux:8	python3-ipaserver	4.9.13-21.module_el8.10.0+4302+2d2000af.3	ALSA-2026:83460
AlmaLinux:9	python3-ipaserver	4.13.4-1.el9_8	ALSA-2026:70564
AlmaLinux:10	python3-ipatests	4.13.4-1.el10_2	ALSA-2026:72279
AlmaLinux:8	python3-ipatests	4.9.13-21.module_el8.10.0+4302+2d2000af.3	ALSA-2026:83460
AlmaLinux:9	python3-ipatests	4.13.4-1.el9_8	ALSA-2026:70564
AlmaLinux:8	python3-jwcrypto	0.5.0-2.module_el8.10.0+3844+20e075e5	ALSA-2026:83460
AlmaLinux:8	python3-kdcproxy	0.4-5.module_el8.10.0+4069+1d9eaa78.2	ALSA-2026:83460
AlmaLinux:8	python3-pyusb	1.0.0-9.1.module_el8.7.0+3349+cfeff52e	ALSA-2026:83460
AlmaLinux:8	python3-qrcode	5.3-1.module_el8.10.0+3942+63b39a46	ALSA-2026:83460
AlmaLinux:8	python3-qrcode-core	5.3-1.module_el8.10.0+3942+63b39a46	ALSA-2026:83460
AlmaLinux:8	python3-yubico	1.3.2-9.1.module_el8.7.0+3349+cfeff52e	ALSA-2026:83460
AlmaLinux:8	slapi-nis	0.60.0-4.module_el8.10.0+3844+20e075e5.alma.1	ALSA-2026:83460
AlmaLinux:8	softhsm	2.6.0-5.module_el8.6.0+3031+2f24dc92	ALSA-2026:83460
AlmaLinux:8	softhsm	2.6.0-5.module_el8.6.0+2881+2f24dc92	ALSA-2026:83460
AlmaLinux:8	softhsm-devel	2.6.0-5.module_el8.6.0+3031+2f24dc92	ALSA-2026:83460
AlmaLinux:8	softhsm-devel	2.6.0-5.module_el8.6.0+2881+2f24dc92	ALSA-2026:83460
Debian:12	freeipa	no fix listed	DEBIAN-CVE-2026-11861
Debian:13	freeipa	no fix listed	DEBIAN-CVE-2026-11861
Rocky Linux:8	bind-dyndb-ldap	0:11.6-6.module+el8.10.0+1960+1ed527b3	RLSA-2026:83460
Rocky Linux:8	custodia	0:0.6.0-3.module+el8.9.0+1371+ffa84eb9	RLSA-2026:83460
Rocky Linux:10	ipa	0:4.13.4-1.el10_2	RLSA-2026:72279
Rocky Linux:8	ipa	0:4.9.13-21.module+el8.10.0+40089+03bf3c1f	RLSA-2026:83460
Rocky Linux:8	ipa	0:4.9.13-21.module+el8.10.0+40090+e6f37a74	RLSA-2026:83460
Rocky Linux:9	ipa	0:4.13.4-1.el9_8	RLSA-2026:70564
Rocky Linux:8	ipa-healthcheck	0:0.12-6.module+el8.10.0+2054+aa003774	RLSA-2026:83460
Rocky Linux:8	ipa-healthcheck	0:0.12-6.module+el8.10.0+2053+a0a9dc19	RLSA-2026:83460
Rocky Linux:8	opendnssec	0:2.1.7-2.module+el8.10.0+1960+1ed527b3	RLSA-2026:83460
Rocky Linux:8	python-jwcrypto	0:0.5.0-2.module+el8.10.0+1818+2dfda7a6	RLSA-2026:83460
Rocky Linux:8	python-jwcrypto	0:0.5.0-2.module+el8.10.0+1819+0aeba2f1	RLSA-2026:83460
Rocky Linux:8	python-kdcproxy	0:0.4-5.module+el8.10.0+2094+d7886766.2	RLSA-2026:83460
Rocky Linux:8	python-kdcproxy	0:0.4-5.module+el8.9.0+1371+ffa84eb9	RLSA-2026:83460
Rocky Linux:8	python-kdcproxy	0:0.4-5.module+el8.10.0+1915+3c70f7d9.1	RLSA-2026:83460
Rocky Linux:8	python-qrcode	0:5.3-1.module+el8.10.0+1915+3c70f7d9	RLSA-2026:83460
Rocky Linux:8	python-qrcode	0:5.3-1.module+el8.10.0+1916+6bb8cf6b	RLSA-2026:83460
Rocky Linux:8	python-yubico	0:1.3.2-9.1.module+el8.9.0+1371+ffa84eb9	RLSA-2026:83460
Rocky Linux:8	python-yubico	0:1.3.2-9.1.module+el8.9.0+1372+09f67869	RLSA-2026:83460
Rocky Linux:8	pyusb	0:1.0.0-9.1.module+el8.9.0+1371+ffa84eb9	RLSA-2026:83460
Rocky Linux:8	pyusb	0:1.0.0-9.1.module+el8.9.0+1372+09f67869	RLSA-2026:83460
Rocky Linux:8	slapi-nis	0:0.60.0-4.module+el8.9.0+1573+39ab85f4	RLSA-2026:83460
Rocky Linux:8	softhsm	0:2.6.0-5.module+el8.9.0+1371+ffa84eb9	RLSA-2026:83460
Ubuntu:22.04:LTS	freeipa	no fix listed	UBUNTU-CVE-2026-11861
Ubuntu:24.04:LTS	freeipa	no fix listed	UBUNTU-CVE-2026-11861
Ubuntu:26.04:LTS	freeipa	no fix listed	UBUNTU-CVE-2026-11861
Ubuntu:26.10	freeipa	no fix listed	UBUNTU-CVE-2026-11861

Affected products (as reported)

Vendor	Product	Versions
Red Hat	Red Hat Enterprise Linux 10	see references
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	see references
Red Hat	Red Hat Enterprise Linux 7 Extended Lifecycle Support	see references
Red Hat	Red Hat Enterprise Linux 8	see references
Red Hat	Red Hat Enterprise Linux 8	see references
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	see references
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	see references
Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	see references
Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	see references
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	see references
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	see references
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	see references
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	see references
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	see references
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	see references
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	see references
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	see references
Red Hat	Red Hat Enterprise Linux 9	see references
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	see references
Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	see references
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	see references
Red Hat	Red Hat Enterprise Linux 6	see references

Weakness: CWE-266 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

References

RHSA-2026:70564 vendor-advisory, x_refsource_REDHAT
RHSA-2026:72279 vendor-advisory, x_refsource_REDHAT
RHSA-2026:82935 vendor-advisory, x_refsource_REDHAT
RHSA-2026:83083 vendor-advisory, x_refsource_REDHAT
RHSA-2026:83084 vendor-advisory, x_refsource_REDHAT
RHSA-2026:83085 vendor-advisory, x_refsource_REDHAT
RHSA-2026:83460 vendor-advisory, x_refsource_REDHAT
RHSA-2026:83461 vendor-advisory, x_refsource_REDHAT
RHSA-2026:89836 vendor-advisory, x_refsource_REDHAT
RHSA-2026:93071 vendor-advisory, x_refsource_REDHAT
RHSA-2026:93452 vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-11861 vdb-entry, x_refsource_REDHAT
RHBZ#2487472 issue-tracking, x_refsource_REDHAT