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Response snapshot Oct 26, 2026, 23:41 UTC

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VulnerabilityCVE-2026-97771

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

At a glance

Exploited
Not known
Severity
8.8 High (CVSS 3.1)
Chance of exploitation
0.7% in the next 30 days
Sources
2 independent sources

What to do

Check the vendor advisory for affected versions and fixes.

Read NVD CVE-2026-97771 (opens a new tab)

Scores and how they were measured

CVSS base severity

8.8

Version 3.1As of

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

0.7%

Scored Percentile 54.4%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    NVD CVE-2026-97771 (opens a new tab)

    NVD record: description, CVSS (the CNA score is preferred), affected products, and publication date. Not evidence of exploitation.

    Published Checked

  2. Primary source

    Vendor advisory (via NVD references) (opens a new tab)

    The vendor advisory referenced by the CVE record, for affected versions and fixes.

    Published Date not suppliedChecked

  3. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  4. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2026-97771, scored 2026-10-26. A model estimate, not proof of exposure.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 15). Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network. (CVE-2026-97771). https://kevwire.com/record/CVE-2026-97771

MLA

"Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network. (CVE-2026-97771)." KEVWire, 15 Oct. 2026, kevwire.com/record/CVE-2026-97771.

Chicago

KEVWire. "Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network. (CVE-2026-97771)." Last modified October 15, 2026. https://kevwire.com/record/CVE-2026-97771.

Evidence summary (plain text)

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network. (Oct 13, 2026).
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
CVSS 8.8 (version 3.1; evidence as of Oct 15, 2026; https://nvd.nist.gov/vuln/detail/CVE-2026-97771).
EPSS 0.7% for the following 30 days, scored Oct 26, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2026-97771&date=2026-10-26).
Sources:
NVD CVE-2026-97771: https://nvd.nist.gov/vuln/detail/CVE-2026-97771
Vendor advisory (via NVD references): https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97771
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-97771
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2026-97771&date=2026-10-26
Record ID: CVE-2026-97771.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 26, 2026, 23:40 UTC. Ingestion is not an independent editorial investigation.

NVD status: Analyzed. Publication in the NVD is not evidence of exploitation.

Looked up on demand from NVD because this CVE is outside the regularly tracked set (older, or rated below HIGH). It is not in CISA's Known Exploited Vulnerabilities catalog as of the last ingestion.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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Record details

Record detail