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TI-2026-79499 Aliases CVE-2026-96185GHSA-p369-hr2h-46vj

Buffer overflow in Microsoft Exchange Online allows code execution

Priority LOW 36CWE-121Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

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

Summary

A stack-based buffer overflow (CWE-121) in Microsoft Exchange Online allows an authorized attacker to execute code over a network. The CVSS 3.1 base score is 7.5 (HIGH), with vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C. Microsoft lists no public disclosure and no known exploitation, and CISA has not added the flaw to KEV. CISA SSVC rates exploitation as none, not automatable, with total technical impact.

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

Description from the CNA

Stack-based buffer overflow in Microsoft Exchange Online allows an authorized attacker to execute code over a network.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0054 45th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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 Exchange Online-—No fix listedCNA
  • Microsoft Exchange Online VendorMicrosoft Affected - Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Microsoft Exchange Online.

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

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Remote Code Execution
Exploited
No
Publicly disclosed
No
Exploitability
—

Timeline

  1. 2026-10-23 Threatist record created from CVE-2026-96185
  2. 2026-10-23 Alias added: GHSA-p369-hr2h-46vj
  3. 2026-10-24 CISA SSVC decision points changed

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