HighVulnerabilityLLM-specific

CVE-2026-26133: M365 Copilot AI command injection allows information disclosure

Source: NVD(opens in a new tab)
Identifier: CVE-2026-26133
Published: March 16, 2026
Record updated: October 9, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.4%

Summary

CVE-2026-26133 describes an AI command injection flaw in M365 Copilot. The source states that an unauthorized attacker can exploit it over a network to disclose information. NVD has not yet provided an assessment, and the vulnerability was published on 03/16/2026.

Mitigation

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

Details

Scores and exploitation

CVSS score: 7.1(high)
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Attack vector: network
Attack complexity: low
Privileges required: none
User interaction: required
EPSS: 0.4%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on November 4, 2026.
Disclosure date: March 16, 2026

Weaknesses and techniques

AI threat technique (MITRE ATLAS): AML.T0051

Affected

Vendors: Microsoft

Classification

Attack type: Prompt injection
Attack sophistication: Moderate
AI component targeted: Plugin
Impact: Confidentiality
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-2026-26133

First tracked: March 16, 2026 at 12:07 PM ET, from NVD/CVE Database

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

Classifier confidence: 90% (self-assessed)

Topics

Coding assistants

Summary

Mitigation

Topics

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