How to secure a SCIM endpoint: Lessons from CVE-2026-109758

CVE-2026-109758, published October 13, 2026, affects Perforce Helix Authentication Service versions 2022.1 through 2025.2 and received a critical CVSS 4.0 score of 9.3 because installation templates included a default SCIM bearer token that could permit unauthorized user and group management when exposed. The issue could be compounded by a prototype-pollution vulnerability in the scim-patch npm library, CVE-2026-61834, allowing crafted SCIM PATCH requests to corrupt application state and potentially lead to service disruption or remote code execution in certain Node.js deployments. Perforce addressed the underlying flaw in HAS 2026.1, while scim-patch fixed its issue in version 0.9.2; no public exploitation reports or CISA Known Exploited Vulnerabilities listing were identified as of publication. The discussion emphasizes that SCIM endpoints often hold administrative-level authority and should use unique per-directory credentials or OAuth client credentials, secure token storage and rotation, schema-based PATCH allowlists, own-property checks, restricted network exposure, explicit role mappings, and detailed audit logging to limit the impact of credential leaks or malicious requests.

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