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TI-2026-72327 Aliases CVE-2026-70264GHSA-878h-ggqr-r6qq

Link following in Microsoft Defender lets local attackers read information

Priority LOW 25CWE-59Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-59 and the CVSS impact.

Summary

Microsoft Windows Defender is affected before 1.1.26090.9. An improper link resolution before file access ('link following') flaw, tracked as CWE-59, lets an authorized local attacker disclose information. The attacker needs low privileges and no user interaction.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Improper link resolution before file access ('link following') in Microsoft Defender allows an authorized attacker to disclose information locally.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00488 42nd percentileScored 2026-11-07
Fix Fixed Windows Defender (Microsoft): 1.1.26090.9

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftWindows Defenderbefore 1.1.26090.91.1.26090.9Patch availableCNA
  • Windows Defender VendorMicrosoft Affected before 1.1.26090.9 Fixed in 1.1.26090.9 Patch available CNA

Remediation

Update Microsoft Windows Defender to version 1.1.26090.9.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Windows Defender (Microsoft) Fixed in 1.1.26090.9

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-70264
  2. 2026-10-13 Alias added: GHSA-878h-ggqr-r6qq
  3. 2026-10-13 CISA SSVC decision points changed
  4. 2026-10-14 Priority changed: MEDIUM → LOW

References

Patch 1

  • TI-2026-42212 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-37256 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-26194 Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-16982 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-36863 Windows Server Update Service (WSUS) Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-33671 Microsoft SharePoint Server Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
See all 18045 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences