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CVE-2026-16071: A flaw was found in the LDAP storage provider of Keycloak, which is used to federate user identities from exte

30
Routine
MEDIUM 5.4WATCHLISTUPGRADE

CVE-2026-16071 is a medium-severity flaw (CVSS 5.4) 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 the LDAP storage provider of Keycloak, which is used to federate user identities from external directories. The issue occurs when a delegated administrator performs a search using a specific LDAP entry Distinguished Name (DN). Due to missing validation, the system allows lookups for users located outside the configured search boundary, leading to the disclosure of account information from unauthorized parts of the directory an

Why this priority

  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score5.4 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance0.3% (top 76%)
CISA exploited listNo
WeaknessCWE-90, CWE-269
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.
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-2026-16071?

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

Is CVE-2026-16071 being exploited?

CVE-2026-16071 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-2026-16071 affect?

CVE-2026-16071 affects build of keycloak. Severity is medium (CVSS 5.4). A flaw was found in the LDAP storage provider of Keycloak, which is used to federate user identities from external directories. The issue occurs when a delegated administrator performs a search using a specific LDAP entry Distinguished Name

How urgent is CVE-2026-16071?

Priority 30/100. On your watchlist

Software pages

Keycloak vulnerabilities

Related CVEs

References

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