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

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeIPA是FreeIPA组织开源的一款身份认证与权限管理产品。 FreeIPA存在权限许可和访问控制问题漏洞，该漏洞源于FreeIPA服务未验证特权属性证书（PAC），可能允许已认证的Active Directory用户通过模拟TGS中的客户端名称绕过身份验证，从而提升权限。

CVSS 9.6 · Critical EPSS 0.22% · P12

Affected Version Matrix 5

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 0:4.13.4-1.el10_2< * unaffected
Red Hat Red Hat Enterprise Linux 6 any unknown
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 0:4.13.4-1.el9_8< * unaffected
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I. Basic Information for CVE-2026-11861

Vulnerability Information
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Vulnerability Title
Freeipa: idm: ipa: freeipa: obtaining tgs with impersonating cname through trust relationships
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
特权授予不正确
Source: CVE Program / CVE List V5
Vulnerability Title
FreeIPA 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeIPA是FreeIPA组织开源的一款身份认证与权限管理产品。 FreeIPA存在权限许可和访问控制问题漏洞，该漏洞源于FreeIPA服务未验证特权属性证书（PAC），可能允许已认证的Active Directory用户通过模拟TGS中的客户端名称绕过身份验证，从而提升权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 0:4.13.4-1.el10_2 ~ * cpe:/o:redhat:enterprise_linux:10.2
Red Hat Red Hat Enterprise Linux 9 0:4.13.4-1.el9_8 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8

II. Public POCs for CVE-2026-11861

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III. Intelligence Information for CVE-2026-11861

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Vendor Advisories for CVE-2026-11861 (3)

Same Patch Batch · Red Hat · 2026-08-20 · 15 CVEs total

CVE-2026-67567 9.9 CRITICAL Multicloud-operators-subscription: multicloud-operators-subscription: helmrelease chart ap
CVE-2026-13097 8.7 HIGH Ipa: privilege escalation via krbcanonicalname manipulation due to realm-unaware uniquenes
CVE-2026-77176 8.1 HIGH Kata-containers: insufficient validation of createcontainer mount and storage rules in gen
CVE-2026-18917 7.8 HIGH Libvirt: integer overflow in nodegetfreepages rpc handler leading to heap buffer overflow
CVE-2026-73137 7.7 HIGH Multicloud-operators-subscription: multicloud-operators-subscription: cross-namespace secr
CVE-2026-73197 7.5 HIGH Ipa: freeipa: unauthenticated dos in `/ipa/migration/migration.py` via unbounded request b
CVE-2026-73198 7.5 HIGH Ipa: freeipa: unauthenticated dos in `/ipa/i18n_messages` via unbounded request body read
CVE-2026-19611 7.4 HIGH Wildfly-elytron: org.wildfly.security/wildfly-elytron-password-impl: wildfly-elytron: pass
CVE-2026-73199 6.5 MEDIUM Ipa: freeipa: null pointer dereference in `ipa-enrollment` extended operation (`join_oid`)
CVE-2026-66787 5.4 MEDIUM Lighthouse: go pprof profiling endpoint enabled unconditionally on lighthouse-agent :8082
CVE-2026-77014 5.3 MEDIUM Libsoup: libsoup: integer truncation in sort_ranges() comparator causes silent omission of
CVE-2026-73196 4.3 MEDIUM Ipa: freeipa: authenticated dos in `otptoken-add` via unbounded otp key decoding/re-encodi
CVE-2026-66788 3.7 LOW Lighthouse: dockerfile build stages use end-of-life fedora 40 referenced by mutable tag
CVE-2026-66785 2.5 LOW Submariner: ipsec psk secrets file created with default world-readable permissions

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-266

V. Comments for CVE-2026-11861

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