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

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. Jul 14, 2026 · NIST NVD

   Detected

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

2. Oct 14, 2026 · NIST NVD

   Updated

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

Affected

• cpe microsoft/365 appsversion unspecified
• cpe microsoft/excel2016
• cpe microsoft/microsoft 365version unspecified
• cpe microsoft/office 2019version unspecified
• cpe microsoft/office 2021version unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-54988

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-54988

  30-day exploitation probability 0.5%

  first.org
• NIST NVDVulnerability recordCVE-2026-54988

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

  nvd.nist.gov

References

• Patch · msrc.microsoft.com