CVE-2026-35440: CWE-552: Files or Directories Accessible to External Parties in Microsoft Microsoft 365 Apps for Enterprise
Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-35440) in Microsoft 365 Apps for Enterprise (Microsoft Office Word) allows unauthorized attackers to disclose information locally by accessing files or directories that should not be externally accessible. The CVSS 3.1 vector indicates local attack vector, low attack complexity, no privileges required, user interaction needed, unchanged scope, high confidentiality impact, no integrity or availability impact, and an official fix is available. The product is cloud-hosted, and Microsoft manages remediation server-side.
Potential Impact
An attacker with local access and user interaction can disclose sensitive information due to improperly accessible files or directories. The confidentiality impact is high, but integrity and availability are not affected. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud service, Microsoft manages the remediation server-side. Users and administrators should ensure their Microsoft 365 Apps for Enterprise are updated according to the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35440.
CVE-2026-35440: CWE-552: Files or Directories Accessible to External Parties in Microsoft Microsoft 365 Apps for Enterprise
Description
Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
CVSS v3.1
Score 5.5medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-35440) in Microsoft 365 Apps for Enterprise (Microsoft Office Word) allows unauthorized attackers to disclose information locally by accessing files or directories that should not be externally accessible. The CVSS 3.1 vector indicates local attack vector, low attack complexity, no privileges required, user interaction needed, unchanged scope, high confidentiality impact, no integrity or availability impact, and an official fix is available. The product is cloud-hosted, and Microsoft manages remediation server-side.
Potential Impact
An attacker with local access and user interaction can disclose sensitive information due to improperly accessible files or directories. The confidentiality impact is high, but integrity and availability are not affected. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud service, Microsoft manages the remediation server-side. Users and administrators should ensure their Microsoft 365 Apps for Enterprise are updated according to the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35440.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-02T19:21:11.805Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35440","vendor":"Microsoft"}]
Threat ID: 6a03654ccbff5d861008c815
Added to database: 05/12/2026, 17:37:16 UTC
Last enriched: 06/19/2026, 17:35:48 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 67
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