Windows Clipboard Server CVE-2026-69795

Requires the attacker to already hold a low-privilege authenticated local session on the Windows host (PR:L, AV:L) and to interact with the Windows Clipboard Server (cfsdisp/clipboard service) component. Exploitation is further LIMITED by high attack complexity (AC:H): the NULL pointer dereference depends on a specific timing/race or memory state that is not reliably reproducible, which is why SSVC rates it Automatable=no. No remote vector and no user-interaction-of-a-victim is involved (UI:N); the constraint is the attacker's own local privilege level and the difficulty of winning the triggering condition. Affected builds span Windows 10 (1809/21H2/22H2), Windows 11 (23H2-26H2), and Windows Server 2019/2022/2025 below the patched build numbers.

This is a moderate-severity local privilege escalation (CVSS 7.0, AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) requiring an attacker to already have low-privilege authenticated access to the target host, plus high attack complexity (AC:H) indicating a race condition, timing window, or non-deterministic memory state must be won. CISA's SSVC framework corroborates low urgency: Exploitation=none (no observed exploitation), Automatable=no (AC:H precludes reliable scripted mass exploitation), though Technical Impact=total aligns with the full C:H/I:H/A:H claim. No EPSS score, no CISA KEV listing, and no public POC were provided, so there is no public exploit identified at time of analysis. CONFLICTING SIGNAL: the CWE is CWE-476 (NULL pointer dereference) and the input Tags include 'Denial Of Service' - both normally imply an availability-only crash - yet the description states privilege elevation and the CVSS asserts full confidentiality AND integrity AND availability impact (C:H/I:H/A:H); a pure null-deref typically yields A:H only, so the dual EoP framing warrants verification against the Microsoft MSRC advisory. Net: this is a real patch-worthy issue for multi-user and shared Windows hosts, but high complexity plus local-only access and no exploitation evidence place it well below internet-facing or wormable priorities - a timely-but-not-emergency patch item.

A low-privileged authenticated user (or malicious code already running in a standard user context) on a Windows system interacts with the Clipboard Server in a way that triggers a NULL pointer dereference under a specific timing or state condition, corrupting kernel/service state to elevate to higher privileges. The high attack complexity (AC:H) means the attacker must reliably win a race or reproduce a precise memory condition. No public exploit code was identified at time of analysis.