CVE-2026-4628: A flaw was found in Keycloak

Routine

MEDIUM 4.3WATCHLISTMITIGATE

CVE-2026-4628 is a medium-severity flaw (CVSS 4.3) 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. An improper Access Control vulnerability in Keycloak’s User-Managed Access (UMA) resource_set endpoint allows attackers with valid credentials to bypass the allowRemoteResourceManagement=false restriction. This occurs due to incomplete enforcement of access control checks on PUT operations to the resource_set endpoint. This issue enables unauthorized modification of protected resources, impacting data integrity.

Why this priority

On your watchlist

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

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-284
Published	2026-03-23
Last modified	2026-10-22

Publisher (CNA): Red Hat, Inc. · Vendor: redhat

Last updated 2026-10-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-23Published CVE record published
2026-10-22 21:17 UTCUpdated 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.

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-2026-4628?

build of keycloak: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-4628 being exploited?

CVE-2026-4628 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-2026-4628 affect?

CVE-2026-4628 affects build of keycloak. Severity is medium (CVSS 4.3). A flaw was found in Keycloak. An improper Access Control vulnerability in Keycloak’s User-Managed Access (UMA) resource_set endpoint allows attackers with valid credentials to bypass the allowRemoteResourceManagement=false restriction. This

How urgent is CVE-2026-4628?

Priority 26/100. On your watchlist

Software pages

Keycloak vulnerabilities

Related CVEs

CVE-2026-4633 LOW 3.7 MITIGATE A flaw was found in Keycloak
CVE-2026-4629 MEDIUM 6.5 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

References

← Back to latest CVEs