PatchTheCVECVE-2026-4633: A flaw was found in Keycloak
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This week
LOW 3.7REMOTEWATCHLISTMITIGATE
CVE-2026-4633 is a low-severity flaw (CVSS 3.7) 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. A remote attacker can exploit differential error messages during the identity-first login flow when Organizations are enabled. This vulnerability allows an attacker to determine the existence of users, leading to information disclosure through user enumeration.
Why this priority
- Public exploit reference
- Remotely exploitable, no login, no user action
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 3.7 (Low) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.5% (top 60%) |
| CISA exploited list | No |
| Weakness | CWE-209 |
| Published | 2026-03-23 |
| Last modified | 2026-10-22 |
Publisher (CNA): Red Hat, Inc. · Vendor: redhat
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
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.
Exact fixes by distribution
A distro patch exists: prefer upgrading over downgrading.
Maven · org.keycloak:keycloak-services · FIXED · 26.6.1 · vulnerable: >= 26.5.0, < 26.6.1 · source
Set org.keycloak:keycloak-services to 26.6.1 or later in pom.xml or build.gradle, then rebuild and redeploy.
Fedora 46 · wasmedge · FIXED · 0.18.1-1.fc46 · FEDORA-2026-4c27216e39 · source
sudo dnf upgrade --advisory=FEDORA-2026-4c27216e39
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.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Related CVEs
- CVE-2026-4629 MEDIUM 6.5 MITIGATE A flaw was found in Keycloak
- CVE-2026-4628 MEDIUM 4.3 MITIGATE A flaw was found in Keycloak
- CVE-2026-37980 MEDIUM 6.9 MITIGATE A flaw was found in Keycloak, specifically in the organization selection login page