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CVE-2026-3121: A flaw was found in Keycloak

38
Routine
MEDIUM 6.5WATCHLISTMITIGATEDOWNGRADEMITIGATE

CVE-2026-3121 is a medium-severity flaw (CVSS 6.5) affecting build of keycloak, jboss enterprise application platform, 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 Keycloak. An administrator with `manage-clients` permission can exploit a misconfiguration where this permission is equivalent to `manage-permissions`. This allows the administrator to escalate privileges and gain control over roles, users, or other administrative functions within the realm. This privilege escalation can occur when admin permissions are enabled at the realm level.

Why this priority

  • On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score6.5 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededHigh
User interactionNone
EPSS exploit chance0.5% (top 59%)
CISA exploited listNo
WeaknessCWE-266
Published2026-03-26
Last modified2026-06-17
Publisher (CNA): Red Hat, Inc. · Vendor: redhat

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Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

redhat build of keycloak 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 build-of-keycloak || rpm -q build-of-keycloak || build-of-keycloak --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
redhat jboss enterprise application platform DOWNGRADE
Affected: 8.0.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 8.0.0
1. Check installed version
apt-cache policy jboss-enterprise-application-platform || rpm -q jboss-enterprise-application-platform || jboss-enterprise-application-platform --version
2. No fixed release: DOWNGRADE to a release before 8.0.0 (Debian / Ubuntu)
apt-cache madison jboss-enterprise-application-platform sudo apt install jboss-enterprise-application-platform=<VERSION_BEFORE_8.0.0> sudo apt-mark hold jboss-enterprise-application-platform
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list jboss-enterprise-application-platform sudo dnf downgrade jboss-enterprise-application-platform-<VERSION_BEFORE_8.0.0> sudo dnf versionlock add jboss-enterprise-application-platform
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-2026-3121?

build of keycloak: mitigate or apply the listed mitigation; jboss enterprise application platform: 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-2026-3121 being exploited?

CVE-2026-3121 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-2026-3121 affect?

CVE-2026-3121 affects build of keycloak, jboss enterprise application platform, jboss enterprise application platform expansion pack. Severity is medium (CVSS 6.5). A flaw was found in Keycloak. An administrator with `manage-clients` permission can exploit a misconfiguration where this permission is equivalent to `manage-permissions`. This allows the administrator to escalate privileges and gain contro

How urgent is CVE-2026-3121?

Priority 38/100. On your watchlist

Software pages

Keycloak vulnerabilities · JBoss and WildFly vulnerabilities

Related CVEs

References

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