Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

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.

1. Oct 13, 2026 · NIST NVD

   Detected

   Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

2. Oct 14, 2026 · NIST NVD

   Updated

   Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

Affected

• cpe microsoft/365 appsversion unspecified
• cpe microsoft/office 2021version unspecified
• cpe microsoft/office 2024version unspecified
• microsoft Microsoft Office LTSC 2021 for 32-bit editionsversion unspecified
• microsoft Microsoft Office LTSC 2021 for 64-bit editionsversion unspecified
• microsoft Microsoft Office LTSC 2024 for 32-bit editionsversion unspecified
• microsoft Microsoft Office LTSC 2024 for 64-bit editionsversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-88190

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-88190

  30-day exploitation probability 0.8%

  first.org
• Microsoft Security Update GuideVendor advisoryCVE-2026-88190

  Microsoft Office LTSC 2024 for 64-bit editions, Microsoft Office LTSC 2024 for 32-bit editions, Microsoft Office LTSC 2021 for 64-bit editions, Microsoft Office LTSC 2021 for 32-bit editions

  msrc.microsoft.com
• NIST NVDVulnerability recordCVE-2026-88190

  Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

  nvd.nist.gov

References

• Vendor Advisory · msrc.microsoft.com