CriticalCVE-2026-11861

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

Published 20.08.2026Last modified 27.10.2026Sources: Red Hat, BSI, CVE.org

What is affected, what to do

Update Red Hat Enterprise Linux 10 to version 0:4.13.4-1.el10_2, Red Hat Enterprise Linux 10.0 Extended Update Support to version 0:4.12.2-15.el10_0.7, Red Hat Enterprise Linux 8 to version 8100020261007071200.143e9e98.

Affected: Red Hat Enterprise Linux 10 lt *..0:4.13.4-1.el10_2
Red Hat Enterprise Linux 10.0 Extended Update Support lt *..0:4.12.2-15.el10_0.7
Red Hat Enterprise Linux 8 lt *..8100020261007071200.143e9e98
Red Hat Enterprise Linux 8 lt *..8100020261007070536.823393f5
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support lt *..8060020261008134123.c1533a64
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support lt *..8060020261008133528.ada582f1
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On lt *..8060020261008134123.c1533a64
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On lt *..8060020261008133528.ada582f1
Red Hat Enterprise Linux 8.8 Telecommunications Update Service lt *..8080020261007080925.e581a9e4
Red Hat Enterprise Linux 8.8 Telecommunications Update Service lt *..8080020261007071832.b0a6ceea
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions lt *..8080020261007080925.e581a9e4
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions lt *..8080020261007071832.b0a6ceea
Red Hat Enterprise Linux 9 lt *..0:4.13.4-1.el9_8
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions lt *..0:4.10.1-12.el9_2.7
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions lt *..0:4.11.0-15.el9_4.9
Red Hat Enterprise Linux 9.6 Extended Update Support lt *..0:4.12.2-14.el9_6.8
Fixed in: 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 8 8100020261007071200.143e9e98
Red Hat Enterprise Linux 8 8100020261007070536.823393f5
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 8060020261008134123.c1533a64
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 8060020261008133528.ada582f1
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 8060020261008134123.c1533a64
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 8060020261008133528.ada582f1
Red Hat Enterprise Linux 8.8 Telecommunications Update Service 8080020261007080925.e581a9e4
Red Hat Enterprise Linux 8.8 Telecommunications Update Service 8080020261007071832.b0a6ceea
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 8080020261007080925.e581a9e4
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 8080020261007071832.b0a6ceea
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
Red Hat Enterprise Linux 9.6 Extended Update Support 0:4.12.2-14.el9_6.8

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

9.6

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: Vendor (CNA), CVSS v3

8.1

CVSS v3

Severity High on the scale from 0 to 10.

Source: Red Hat, BSI, CVE.org

0.4 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 28.5

Show all metrics

Severity: Critical
Priority (0–325) The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first? Read in glossary: 70.82 Methodology
Exploit maturity An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack. Read in glossary: no public PoC known
XIEM Effective CVSS XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command. Read in glossary: 9.6 Methodology
CVSS v3 CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions. Read in glossary: 8.1
EPSS score The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“. Read in glossary: 0.4 %; Low — model estimates < 1% exploitation likelihood.
EPSS percentile The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking. Read in glossary: 28.5; Elevated — this CVE ranks above at least 10% of all CVEs scored today.
KEV status The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: —
Published: 20.08.2026
CISA assessment (SSVC): Exploitation: none known · not automatable · Technical impact: total; Source: CISA Vulnrichment, as of 20 August 2026
CWE CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect. Read in glossary: CWE-266

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2 NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management. Read in glossary: High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates. Read in glossary: From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001 ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security. Read in glossary: Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

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: redhat_csaf, BSI WID Portal, BSI CSAF, cvelistv5, NVD (NIST)

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
Red Hat	Red Hat Enterprise Linux 10	`< 0:4.13.4-1.el10_2`	`0:4.13.4-1.el10_2`
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	`< 0:4.12.2-15.el10_0.7`	`0:4.12.2-15.el10_0.7`
Red Hat	Red Hat Enterprise Linux 6	`—`	—
Red Hat	Red Hat Enterprise Linux 7	`—`	—
Red Hat	Red Hat Enterprise Linux 8	`< 8100020261007071200.143e9e98` `< 8100020261007070536.823393f5`	`8100020261007071200.143e9e98` `8100020261007070536.823393f5`
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	`< 8060020261008134123.c1533a64` `< 8060020261008133528.ada582f1`	`8060020261008134123.c1533a64` `8060020261008133528.ada582f1`
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	`< 8060020261008134123.c1533a64` `< 8060020261008133528.ada582f1`	`8060020261008134123.c1533a64` `8060020261008133528.ada582f1`
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	`< 8080020261007080925.e581a9e4` `< 8080020261007071832.b0a6ceea`	`8080020261007080925.e581a9e4` `8080020261007071832.b0a6ceea`
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	`< 8080020261007080925.e581a9e4` `< 8080020261007071832.b0a6ceea`	`8080020261007080925.e581a9e4` `8080020261007071832.b0a6ceea`
Red Hat	Red Hat Enterprise Linux 9	`< 0:4.13.4-1.el9_8`	`0:4.13.4-1.el9_8`
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	`< 0:4.10.1-12.el9_2.7`	`0:4.10.1-12.el9_2.7`
Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	`< 0:4.11.0-15.el9_4.9`	`0:4.11.0-15.el9_4.9`
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	`< 0:4.12.2-14.el9_6.8`	`0:4.12.2-14.el9_6.8`
freeipa	freeipa	`< 4.13.3`	`4.13.3`
Red Hat	Enterprise Linux	`9`	—

Vendors and products

Affected operating systems

Affected operating systems

Linux	redhat	enterprise_linux	`10.0`
Linux	redhat	enterprise_linux	`7.0`
Linux	redhat	enterprise_linux	`8.0`
Linux	redhat	enterprise_linux	`9.0`

Weakness classes (CWE)

CWE-266Incorrect Privilege Assignment
Base
A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.
Entry at MITRE CWE-266

References & sources

access.redhat.comsecurity/cve/CVE-2026-11861Vulnerability database, x_refsource_REDHAT, Vendor advisory
bugzilla.redhat.comRHBZ#2487472Issue tracking, x_refsource_REDHAT, Issue tracking, Vendor advisory
access.redhat.comRHSA-2026:70564Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:72279Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:82935Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:83083Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:83084Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:83085Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:83460Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:83461Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:89836Vendor advisory, x_refsource_REDHAT

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

26.10.2026Record modifiedRed Hat

New references:

https://access.redhat.com/errata/RHSA-2026:89836

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/11xxx/CVE-2026-11861.json">CVE-2026-11861</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:89836

Source identifier: secalert@redhat.com

15.10.2026Record modifiedRed Hat

New references:

Show 3 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/11xxx/CVE-2026-11861.json">CVE-2026-11861</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:83460
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:83461

Source identifier: secalert@redhat.com

14.10.2026Record modifiedRed Hat

New references:

https://access.redhat.com/errata/RHSA-2026:83084

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/11xxx/CVE-2026-11861.json">CVE-2026-11861</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:83084

Source identifier: secalert@redhat.com

14.10.2026Record modifiedRed Hat

New references:

Show 3 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/11xxx/CVE-2026-11861.json">CVE-2026-11861</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:83083
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:83085

Source identifier: secalert@redhat.com

14.10.2026Record modifiedRed Hat

New references:

https://access.redhat.com/errata/RHSA-2026:82935

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/11xxx/CVE-2026-11861.json">CVE-2026-11861</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:82935

Source identifier: secalert@redhat.com

Show 5 older changes

28.09.2026Record modifiedRed Hat

New references:

https://access.redhat.com/errata/RHSA-2026:72279

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/11xxx/CVE-2026-11861.json">CVE-2026-11861</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:72279

Source identifier: secalert@redhat.com

24.09.2026Record modifiedRed Hat

New references:

Show 8 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/11xxx/CVE-2026-11861.json">CVE-2026-11861</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:70564
Reference	added	—	https://access.redhat.com/security/cve/CVE-2026-11861
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=2487472
Reference	removed	https://access.redhat.com/security/cve/CVE-2026-11861	—
Reference	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2487472	—
Reference type	removed	https://access.redhat.com/security/cve/CVE-2026-11861 Types: Vendor Advisory	—
Reference type	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2487472 Types: Issue Tracking, Vendor Advisory	—

Source identifier: secalert@redhat.com

24.08.2026Initial analysis by NVDNVD

Newly listed as affected:

Red Hat IPA (before 4.13.3)
Red Hat Redhat Enterprise Linux (7.0, 8.0, 9.0, 10.0)

CVSS V3.1: AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

New references:

Show 5 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
CVSS	added	—	AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Product configuration	added	—	OR cpe:2.3:a:freeipa:freeipa::::::::* versions up to (excluding) 4.13.3
Product configuration	added	—	OR cpe:2.3:o:redhat:enterprise_linux:7.0::::::: cpe:2.3:o:redhat:enterprise_linux:8.0::::::: cpe:2.3:o:redhat:enterprise_linux:9.0::::::: cpe:2.3:o:redhat:enterprise_linux:10.0:::::::
Reference type	added	—	Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2026-11861 Types: Vendor Advisory
Reference type	added	—	Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2487472 Types: Issue Tracking, Vendor Advisory

Source identifier: nvd@nist.gov

20.08.2026Record modifiedCISA ADP

CISA assessment (SSVC): exploitation: none known, automatable: no

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
SSVC assessment	added	—	{"id":"CVE-2026-11861","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-08-20T13:48:14.824853Z"}

Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

20.08.2026ReceivedRed Hat

CVSS V3.1: AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Weakness type: CWE-266

Description added or changed

New references:

Show 6 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 (+2)
Description	added	—	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.
CVSS	added	—	AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Weakness type (CWE)	added	—	CWE-266
Reference	added	—	https://access.redhat.com/security/cve/CVE-2026-11861
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=2487472

Source identifier: secalert@redhat.com

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<a href="https://intel.neosec.eu/en/cve/CVE-2026-11861"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-11861.svg?lang=en" alt="CVE-2026-11861 – NEOSEC Intel" height="20"></a>