What is the CVSS score of CVE-2026-45586?

CVE-2026-45586 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Windows Collaborative Translation Framework are affected by CVE-2026-45586?

A local privilege escalation vulnerability in Windows Collaborative Translation Framework (CVE-2026-45586, CVSS 7.8) enables authorized local users to escalate to elevated system privileges, creating…. A patch is available.

How to fix or mitigate CVE-2026-45586?

24 hours: Inventory all systems running Windows Collaborative Translation Framework; disable the service where operationally feasible and restrict local user access on critical systems. 7 days: Deploy monitoring for privilege escalation attempts and symbolic link abuse targeting system directories; audit local user accounts and enforce least-privilege policies. 30 days: Establish Microsoft patch availability timeline; implement organization-wide compensating controls; assess business criticality for any systems where the framework cannot be disabled.

Windows Collaborative Translation Framework CVE-2026-45586

EUVD-2026-35548 HIGH

Improper Link Resolution Before File Access (CWE-59)

2026-06-09 secure@microsoft.com

GHSA-w47j-rgg9-c6p2

Information Disclosure Microsoft Windows 10 1607 Windows 10 1809 Windows 10 21h2 Windows 10 22h2 Windows 11 23h2 Windows 11 24h2 Windows 11 25h2 Windows 11 26h1 Windows Server 2012 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows Server 2025

7.8

CVSS 3.1 · Vendor: microsoft

Temporal: 6.8

Severity by source

Vendor (microsoft) PRIMARY

7.8 HIGH

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CIRCL (temporal)

6.8 MEDIUM

cvss

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch available

Jun 09, 2026 - 19:03 EUVD

Analysis Generated

Jun 09, 2026 - 18:16 vuln.today

CVE Published

Jun 09, 2026 - 17:17 nvd

HIGH 7.8

DescriptionCVE.org

Improper link resolution before file access ('link following') in Windows Collaborative Translation Framework allows an authorized attacker to elevate privileges locally.

AnalysisAI

Local privilege escalation in Windows Collaborative Translation Framework permits an authorized low-privileged user to gain elevated rights on affected Windows systems by abusing improper symbolic link resolution before file access. The flaw yields high confidentiality, integrity, and availability impact (CVSS 7.8) but requires existing local access. No public exploit identified at time of analysis and the issue is not listed in CISA KEV.

Technical ContextAI

The Collaborative Translation Framework (CTF) is a long-standing Windows subsystem (ctfmon/msctf) that brokers text input, IME, and language services between processes and the active input session, often running with elevated privilege to serve interactive desktops. CWE-59 (Improper Link Resolution Before File Access, or 'link following') indicates that a CTF component operates on a file path without first canonicalizing or validating that the target is not a symbolic link, junction, or hard link. A local attacker who controls a path that the privileged process touches can redirect file operations - typically writes, deletes, or DACL changes - to a sensitive location, causing the high-privileged process to act on attacker-chosen targets.

RemediationAI

Apply the Microsoft security update referenced in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45586 (patch available per vendor advisory; the specific KB and fixed build for each Windows SKU should be taken directly from that page). As a temporary compensating control until patching, restrict interactive and remote-desktop logon rights on multi-user hosts to trusted accounts so unprivileged local users cannot stage the symlink primitive, and consider enabling the Windows symbolic link evaluation restrictions (fsutil behavior set SymlinkEvaluation) so non-admin local-to-local symlinks are disabled - note this can break legitimate developer workflows and some installers that rely on link evaluation. Disabling or restricting the Text Services Framework (ctfmon) is not a safe workaround because it breaks IME and accessibility input and should not be used.