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PatchSiren cyber security CVE debrief

CVE-2026-11986 Red Hat CVE debrief

A flaw was found in the admin-ui-ext component of Keycloak, which provides extended administrative user interface capabilities. The issue occurs because certain bulk role-removal endpoints fail to perform granular permission checks when deleting role mappings. This allows a delegated administrator with limited permissions to remove highly privileged roles from other users or groups, potentially disrupting administrative access control.

Vendor
Red Hat
Product
Red Hat Build of Keycloak
CVSS
MEDIUM 4.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-11
Original CVE updated
2026-08-11
Advisory published
2026-06-11
Advisory updated
2026-08-11

Who should care

Administrators of Keycloak instances, particularly those with delegated administrative access, should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The admin-ui-ext component of Keycloak contains a flaw that allows a delegated administrator with limited permissions to remove highly privileged roles from other users or groups. This is due to certain bulk role-removal endpoints failing to perform granular permission checks when deleting role mappings.

Defensive priority

MEDIUM

Recommended defensive actions

  • Apply patches or updates provided by the vendor to address the vulnerability.
  • Review and restrict delegated administrative access to minimize the impact of this vulnerability.
  • Monitor Keycloak instance logs for suspicious role-removal activity.

Evidence notes

The CVE-2026-11986 record was obtained from the official CVE database and the NVD detail page.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-11986 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-11986

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-11986 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-11986

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.