MediumVulnerabilityLLM-specific

CVE-2026-41100: M365 Copilot improper access control allows local spoofing

Source: NVD(opens in a new tab)
Identifier: CVE-2026-41100
Published: May 12, 2026
Record updated: October 9, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.3%

Summary

CVE-2026-41100 is an improper access control flaw (CWE-284) in M365 Copilot. The source states that an authorized attacker can perform spoofing locally. NVD had not yet provided an assessment when the record was published on 05/12/2026.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Details

Scores and exploitation

CVSS score: 4.4(medium)
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack vector: local
Attack complexity: low
Privileges required: low
User interaction: none
EPSS: 0.3%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on October 13, 2026.
Disclosure date: May 12, 2026

Weaknesses and techniques

Weakness (CWE): CWE-284

Affected

Vendors: Microsoft

Classification

Attack sophistication: Moderate
AI component targeted: Plugin
Impact: Integrity
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-41100

First tracked: May 12, 2026 at 08:09 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 85% (self-assessed)

Topics

Coding assistants

Summary

Mitigation

Topics

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