CVE-2026-11861: A flaw was found in FreeIPA

Q: How do I fix CVE-2026-11861?

freeipa: upgrade to 4.13.3; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2026-11861 being exploited?

CVE-2026-11861 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-11861 affect?

CVE-2026-11861 affects freeipa, enterprise linux. Severity is critical (CVSS 9.6). 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

Q: How urgent is CVE-2026-11861?

Priority 46/100. Critical severity; On your watchlist

This month

CRITICAL 9.6WATCHLISTUPGRADEMITIGATE

CVE-2026-11861 is a critical-severity flaw (CVSS 9.6) affecting freeipa, enterprise linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 authentic

Why this priority

Critical severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 72%)
CISA exploited list	No
Weakness	CWE-266
Published	2026-08-20
Last modified	2026-10-26

Publisher (CNA): Red Hat, Inc. · Vendor: freeipa · redhat

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-20 11:16 UTCPublished CVE record published
2026-10-26 14:16 UTCUpdated Record last modified

freeipa freeipa UPGRADE

Affected: < 4.13.3

Fixed in: 4.13.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy freeipa || rpm -q freeipa || freeipa --version

2. UPGRADE to 4.13.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade freeipa

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade freeipa

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

redhat enterprise linux MITIGATE

Affected: 7.0 · 8.0 · 9.0 · 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-11861?

freeipa: upgrade to 4.13.3; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-11861 being exploited?

CVE-2026-11861 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-11861 affect?

CVE-2026-11861 affects freeipa, enterprise linux. Severity is critical (CVSS 9.6). 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

How urgent is CVE-2026-11861?

Priority 46/100. Critical severity; On your watchlist

Software pages

Active Directory vulnerabilities

Related CVEs

CVE-2026-73198 HIGH 7.5 MITIGATE UPGRADE A flaw was found in FreeIPA
CVE-2026-73197 HIGH 7.5 MITIGATE UPGRADE A flaw was found in FreeIPA
CVE-2026-19550 HIGH 8.2 MITIGATE UPGRADE A flaw was found in FreeIPA
CVE-2026-13097 HIGH 8.7 MITIGATE DOWNGRADE A privilege escalation flaw was found in FreeIPA

References

← Back to latest CVEs