How severe is CVE-2026-0871?

CVE-2026-0871 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-0871 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-0871?

CVE-2026-0871 primarily affects Redhat Build Of Keycloak. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-0871?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-0871 have an EU (EUVD) identifier?

Yes. CVE-2026-0871 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9005.

When was CVE-2026-0871 published?

CVE-2026-0871 was published on 2026-02-27 and last updated on 2026-06-17.

CVE-2026-0871

CVE-2026-0871 is a medium-severity vulnerability in Redhat Build Of Keycloak with a CVSS 3.x base score of 4.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-266.

Key facts

Severity: Medium (CVSS 3.x base score 4.9)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9005
Weakness: CWE-266
Affected product: Redhat Build Of Keycloak
Published: 2026-02-27
Last modified: 2026-06-17

Description

A flaw was found in Keycloak. An administrator with `manage-users` 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.

Frequently asked questions

What is CVE-2026-0871?: A flaw was found in Keycloak. An administrator with `manage-users` 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.
How severe is CVE-2026-0871?: CVE-2026-0871 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-0871 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-0871?: CVE-2026-0871 primarily affects Redhat Build Of Keycloak. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-0871?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-0871 have an EU (EUVD) identifier?: Yes. CVE-2026-0871 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9005.
When was CVE-2026-0871 published?: CVE-2026-0871 was published on 2026-02-27 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:text-only:*:*:*
cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*

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