Vulnerability · CVE-2026-88186
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
Published Oct 13, 2026 · catalog updated Oct 15, 2026 · 365 apps
Check if you run it
No confirmed exploitation is on record for CVE-2026-88186. EPSS is 0.72%. Act only if a listed version of 365 apps is installed.
Gaps on this record
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High8.8
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.72%
- Remediation
- Advisory link
- Affected products
- cpe microsoft/365 apps · cpe microsoft/microsoft 365 · cpe microsoft/office 2021 · cpe microsoft/office 2024 · microsoft Microsoft Office LTSC 2024 for 32-bit editions
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe microsoft/365 appsversion unspecified
- cpe microsoft/microsoft 365version unspecified
- cpe microsoft/office 2021version unspecified
- cpe microsoft/office 2024version unspecified
- microsoft Microsoft Office LTSC 2024 for 32-bit editionsversion unspecified
How to fix CVE-2026-88186
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-88186. EPSS is 0.72%. Act only if a listed version of 365 apps is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-122: Heap-based Buffer Overflow; CWE-190: Integer Overflow. EPSS 0.72%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Oct 13, 2026 · NIST NVD
Detected
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
Oct 14, 2026 · NIST NVD
Updated
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
Oct 15, 2026 · NIST NVD
Updated
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
Sources
- CVE.orgVulnerability recordCVE-2026-88186
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-88186
30-day exploitation probability 0.7%
first.org - Microsoft Security Update GuideVendor advisoryCVE-2026-88186
Microsoft Office LTSC 2024 for 32-bit editions
msrc.microsoft.com - NIST NVDVulnerability recordCVE-2026-88186
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.