CVE-2025-12150: A flaw was found in Keycloak’s WebAuthn registration component

Routine

LOW 3.1WATCHLISTUPGRADEDOWNGRADE

CVE-2025-12150 is a low-severity flaw (CVSS 3.1) affecting build of keycloak, keycloak. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in Keycloak’s WebAuthn registration component. This vulnerability allows an attacker to bypass the configured attestation policy and register untrusted or forged authenticators via submission of an attestation object with fmt: "none", even when the realm is configured to require direct attestation. This can lead to weakened authentication integrity and unauthorized authenticator registration.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	3.1 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-347
Published	2026-02-27
Last modified	2026-08-10

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

Last updated 2026-08-10 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-27 09:16 UTCPublished CVE record published
2026-08-10 03:16 UTCUpdated Record last modified

redhat build of keycloak UPGRADE

Affected: < 26.4.4 · all versions

Fixed in: 26.4.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy build-of-keycloak || rpm -q build-of-keycloak || build-of-keycloak --version

2. UPGRADE to 26.4.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade build-of-keycloak

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade build-of-keycloak

Note

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

redhat keycloak DOWNGRADE

Affected: 24.0.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 24.0.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 24.0.2 (Debian / Ubuntu)

apt-cache madison keycloak sudo apt install keycloak=<VERSION_BEFORE_24.0.2> sudo apt-mark hold keycloak

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list keycloak sudo dnf downgrade keycloak-<VERSION_BEFORE_24.0.2> sudo dnf versionlock add keycloak

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2025-12150?

build of keycloak: upgrade to 26.4.4; keycloak: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-12150 being exploited?

CVE-2025-12150 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-2025-12150 affect?

CVE-2025-12150 affects build of keycloak, keycloak. Severity is low (CVSS 3.1). A flaw was found in Keycloak’s WebAuthn registration component. This vulnerability allows an attacker to bypass the configured attestation policy and register untrusted or forged authenticators via submission of an attestation object with f

How urgent is CVE-2025-12150?

Priority 19/100. On your watchlist

Software pages

Keycloak vulnerabilities

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References

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