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Vulnerabilities

Vulnerability · CVE-2026-0871

A flaw was found in Keycloak.

Published Feb 27, 2026 · catalog updated Jun 17, 2026 · build of keycloak

Check if you run it

No confirmed exploitation is on record for CVE-2026-0871. EPSS is 0.33%. Act only if a listed version of build of keycloak is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium4.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.33%
Remediation
Advisory link
Affected products
cpe redhat/build of keycloak · cpe redhat/keycloak

A flaw was found in Keycloak. An administrator with permission can bypass the "Only administrators can view" setting for unmanaged attributes, allowing them to modify these attributes. This improper access control can lead to unauthorized changes to user profiles, even when the system is configured to restrict such modifications.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe redhat/build of keycloakversion unspecified
  • cpe redhat/keycloakversion unspecified

How to fix CVE-2026-0871

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-0871. EPSS is 0.33%. Act only if a listed version of build of keycloak is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-266. EPSS 0.33%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 27, 2026 · NIST NVD

    Detected

    A flaw was found in Keycloak. An administrator with permission can bypass the "Only administrators can view" setting for unmanaged attributes, allowing them to modify these attributes. This improper access control can lead to unauthorized changes to user profiles, even when the system is configured to restrict such modifications.

  2. Jun 17, 2026 · NIST NVD

    Updated

    A flaw was found in Keycloak. An administrator with permission can bypass the "Only administrators can view" setting for unmanaged attributes, allowing them to modify these attributes. This improper access control can lead to unauthorized changes to user profiles, even when the system is configured to restrict such modifications.

Sources

  • CVE.orgVulnerability recordCVE-2026-0871

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-0871

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-0871

    A flaw was found in Keycloak. An administrator with permission can bypass the "Only administrators can view" setting for unmanaged attributes, allowing them to modify these attributes. This improper access control can lead to unauthorized changes to user profiles,

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.