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CVE-2026-15572: A flaw was found in Keycloak's Dynamic Client Registration (DCR) security policy management

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This month
HIGH 8.8WATCHLISTUPGRADE

CVE-2026-15572 is a high-severity flaw (CVSS 8.8) affecting build of 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 Dynamic Client Registration (DCR) security policy management. The "Allowed Protocol Mapper Types" policy, which restricts which types of data mappers a client can use, fails to re-validate the mapper type during a client update if the mapper's configuration remains unchanged. An attacker with client registration privileges can exploit this by first registering an allowed mapper type with a malicious configuration an

Why this priority

  • High severity
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score8.8 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance0.7% (top 49%)
CISA exploited listNo
WeaknessCWE-843
Published2026-08-05
Last modified2026-08-10
Publisher (CNA): Red Hat, Inc. · Vendor: redhat

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Last updated 2026-08-10 · 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.
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-2026-15572?

build of keycloak: upgrade to 26.4.14, 26.6.5. Exact commands for each OS are on this page.

Is CVE-2026-15572 being exploited?

CVE-2026-15572 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-2026-15572 affect?

CVE-2026-15572 affects build of keycloak. Severity is high (CVSS 8.8). A flaw was found in Keycloak's Dynamic Client Registration (DCR) security policy management. The "Allowed Protocol Mapper Types" policy, which restricts which types of data mappers a client can use, fails to re-validate the mapper type duri

How urgent is CVE-2026-15572?

Priority 49/100. High severity; On your watchlist

Software pages

Keycloak vulnerabilities

Related CVEs

References

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