Heap-Based Buffer Overflow in Microsoft Windows (CVE‑2026‑85880) Enables Local Privilege Escalation
What It Is – Microsoft Windows Advanced Local Procedure Call (ALPC) contains a heap‑based buffer overflow that can be triggered locally to gain SYSTEM‑level privileges.
Exploitability – The vulnerability is publicly disclosed in the CISA Known Exploited Vulnerabilities (KEV) catalog; proof‑of‑concept code has been observed, indicating active exploitation is feasible. CVSS v3.1 ≈ 8.8 (High).
Affected Products – Microsoft Windows operating systems (all supported editions that include the ALPC component).
Why It Matters for Trust & Control Assurance
- Access‑control hygiene – Privilege‑escalation flaws expose gaps in least‑privilege enforcement and privileged‑account monitoring, a core control objective across most frameworks.
- Patch‑management evidence – Demonstrating timely remediation of high‑severity OS flaws is a key piece of audit‑ready evidence for continuous control assurance.
- Defensible audit trail – Organizations that can prove they detected, prioritized, and patched this CVE have stronger evidence of due‑diligence during third‑party security reviews.
Recommended Actions
- Deploy Microsoft’s security update for CVE‑2026‑85880 without delay.
- Verify that privileged‑account activity logging is enabled and that alerts fire on unexpected elevation attempts.
- Update your vulnerability‑management workflow to capture remediation evidence for audit purposes.
Source: CISA KEV – CVE‑2026‑85880