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CVE-2026-26129

M365 Copilot Information Disclosure Vulnerability

HIGH
7.5
CVSS Score
Published: May 7, 2026 at 08:58 PM UTC
Updated: June 17, 2026 at 10:25 AM UTC
1 product affected across 1 vendor365 Copilot Chat

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Severity
HIGH7.5
Exploit prediction
EPSS 1%
SSVC
No known exploit

Description

Improper neutralization of special elements in M365 Copilot allows an unauthorized attacker to disclose information over a network.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26129

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHmicrosoft
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-138

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