What is the CVSS score of CVE-2026-26107?

CVE-2026-26107 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of 365 Apps are affected by CVE-2026-26107?

A use-after-free vulnerability in Microsoft Office Excel (CVE-2026-26107) enables local code execution with HIGH severity.. A patch is available.

How to fix or mitigate CVE-2026-26107?

Within 24 hours: Inventory all Excel deployments and identify high-risk user populations (finance, legal, external-facing roles). Within 7 days: Implement compensating controls (disable macros, restrict file types, deploy application whitelisting) and communicate risks to users. Within 30 days: Monitor vendor advisory for patch availability and establish expedited deployment plan; consider restricting Excel to isolated environments for untrusted file handling.

365 Apps CVE-2026-26107

HIGH

Use After Free (CWE-416)

2026-03-10 secure@microsoft.com

Denial Of Service Use After Free Memory Corruption Microsoft 365 Apps Excel Office Office Long Term Servicing Channel Office Online Server

7.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Mar 10, 2026 - 18:18 nvd

HIGH 7.8

DescriptionCVE.org

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

AnalysisAI

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally. [CVSS 7.8 HIGH]

Technical ContextAI

Classified as CWE-416 (Use After Free). Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

RemediationAI

Monitor vendor advisories for a patch.

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CVE-2026-26107 vulnerability details – vuln.today

Back

365 Apps CVE-2026-26107

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

More in 365 Apps

Same weakness CWE-416 – Use After Free

Same technique Denial Of Service

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External POC / Exploit Code