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CVE-2026-47645

Microsoft 365 Copilot's Business Chat Elevation of Privilege Vulnerability

HIGH
8.8
CVSS Score
Published: June 19, 2026 at 08:29 PM UTC
Updated: October 25, 2026 at 11:10 PM UTC
1 product affected across 1 vendor365 Copilot

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Severity
HIGH8.8
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

Description

Url redirection to untrusted site ('open redirect') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to elevate privileges 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-2026-47645

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

8.8HIGHmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-601

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