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CVE-2026-16102: A flaw was found in the Dynamic Client Registration (DCR) component of Keycloak, an identity and access manage

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This month
HIGH 8.1WATCHLISTUPGRADEDOWNGRADEMITIGATE

CVE-2026-16102 is a high-severity flaw (CVSS 8.1) affecting build of keycloak, data grid, jboss enterprise application platform expansion pack. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in the Dynamic Client Registration (DCR) component of Keycloak, an identity and access management solution. The default DCR policy fails to properly validate the claim path for User Property mappers, allowing them to write values to sensitive internal claim locations. An attacker with a standard user account and a limited Initial Access Token can exploit this to forge administrative roles in their access token. This allows the at

Why this priority

  • High severity
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score8.1 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance0.5% (top 60%)
CISA exploited listNo
WeaknessCWE-551, CWE-284
Published2026-08-05
Last modified2026-08-31
Publisher (CNA): Red Hat, Inc. · Vendor: redhat

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Last updated 2026-08-31 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

redhat build of keycloak UPGRADE
Affected: >= 26.4 and < 26.4.14 · >= 26.6 and < 26.6.5
Fixed in: 26.4.14, 26.6.5
Safe to downgrade to: a release before 26.4
1. Check installed version
apt-cache policy build-of-keycloak || rpm -q build-of-keycloak || build-of-keycloak --version
2. UPGRADE to 26.4.14 (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.
3. If no update is available yet, DOWNGRADE to a release before 26.4 (Debian / Ubuntu)
apt-cache madison build-of-keycloak sudo apt install build-of-keycloak=<VERSION_BEFORE_26.4> sudo apt-mark hold build-of-keycloak
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list build-of-keycloak sudo dnf downgrade build-of-keycloak-<VERSION_BEFORE_26.4> sudo dnf versionlock add build-of-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.
redhat data grid DOWNGRADE
Affected: 8.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 8.0
1. Check installed version
apt-cache policy data-grid || rpm -q data-grid || data-grid --version
2. No fixed release: DOWNGRADE to a release before 8.0 (Debian / Ubuntu)
apt-cache madison data-grid sudo apt install data-grid=<VERSION_BEFORE_8.0> sudo apt-mark hold data-grid
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list data-grid sudo dnf downgrade data-grid-<VERSION_BEFORE_8.0> sudo dnf versionlock add data-grid
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.
redhat jboss enterprise application platform expansion pack MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy jboss-enterprise-application-platform-expansion-pack || rpm -q jboss-enterprise-application-platform-expansion-pack || jboss-enterprise-application-platform-expansion-pack --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
redhat single sign-on DOWNGRADE
Affected: 7.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.0
1. Check installed version
apt-cache policy single-sign-on || rpm -q single-sign-on || single-sign-on --version
2. No fixed release: DOWNGRADE to a release before 7.0 (Debian / Ubuntu)
apt-cache madison single-sign-on sudo apt install single-sign-on=<VERSION_BEFORE_7.0> sudo apt-mark hold single-sign-on
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list single-sign-on sudo dnf downgrade single-sign-on-<VERSION_BEFORE_7.0> sudo dnf versionlock add single-sign-on
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-2026-16102?

build of keycloak: upgrade to 26.4.14, 26.6.5; data grid: downgrade or apply the listed mitigation; jboss enterprise application platform expansion pack: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-16102 being exploited?

CVE-2026-16102 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-2026-16102 affect?

CVE-2026-16102 affects build of keycloak, data grid, jboss enterprise application platform expansion pack. Severity is high (CVSS 8.1). A flaw was found in the Dynamic Client Registration (DCR) component of Keycloak, an identity and access management solution. The default DCR policy fails to properly validate the claim path for User Property mappers, allowing them to write

How urgent is CVE-2026-16102?

Priority 43/100. High severity; On your watchlist

Software pages

Keycloak vulnerabilities · JBoss and WildFly vulnerabilities

Related CVEs

References

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