Read the docs
TI-2026-31098 Aliases CVE-2026-42893GHSA-h35m-vhjw-vqxj

Microsoft Outlook for iOS Tampering Vulnerability

Priority LOW 33CWE-77Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Tampering
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from Microsoft.

Summary

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to perform tampering over a network.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00399 34th percentileScored 2026-11-07
Fix Fixed Microsoft Outlook for iOS (Microsoft): 5.2617.1

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
MicrosoftMicrosoft Outlook for iOS1.0.0 to before 5.2617.15.2617.1Patch availableCNA
  • Microsoft Outlook for iOS VendorMicrosoft Affected 1.0.0 to before 5.2617.1 Fixed in 5.2617.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:outlook:*:*:*:*:*:iphone_os:*:*before 5.2617.1VulnerableMicrosoft
  • cpe:2.3:a:microsoft:outlook:*:*:*:*:*:iphone_os:*:* Versions before 5.2617.1 Vulnerable ·Microsoft

Remediation

  • Fix · CNA Microsoft Outlook for iOS (Microsoft) Fixed in 5.2617.1

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Tampering
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely
ProductStatusPlan or fix
Microsoft Outlook for iOSFixed5.2617.1 Security Update

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42893
  2. 2026-10-03 Alias added: GHSA-h35m-vhjw-vqxj
  3. 2026-10-25 EPSS moved to the below the 50th percentile

References

Patch 1

  • TI-2023-09240 Microsoft Outlook Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-17652 Microsoft Outlook Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2007-00655 Unspecified vulnerability in Microsoft Excel 2000, XP, 2003, and 2004 for Mac, and… KEVCVSS 3.1HIGH 8.8
  • TI-2017-08726 Memory corruption in Microsoft Outlook KEVCVSS 3.1HIGH 7.8
  • TI-2015-01471 Microsoft Word 2007 SP3, Office 2010 SP2, Word 2010 SP2, Word 2013 SP1, Word 2013 RT SP1… KEVCVSS 3.1HIGH 7.8
  • TI-2006-04695 Stack-based buffer overflow in the Vector Graphics Rendering engine (vgx.dll), as used in… CVSS 2.0HIGH 9.3
See all 124 →

Sources

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