CVE-2026-47644: Copilot Chat (Microsoft Edge) Information Disclosure Vulnerability

mediumCVSS 6.5CVE-2026-47644

Improper neutralization of special elements in output used by a downstream component ('injection') in Copilot Chat (Microsoft Edge) allows an unauthorized attacker to disclose information over a network.

CSIRTS triage

vendor: Microsoft product: Edge Information disclosure

What: Improper neutralization of special elements in output allows an unauthorized attacker to disclose information over a network.
Who is affected: Users of Microsoft Edge with Copilot Chat feature enabled.
Urgency: Remediation is important due to the medium severity and potential for information disclosure.
Action: Apply the latest security patch for Microsoft Edge.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 6.5
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47644

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-476440.73% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 52% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-47644	coverage & exploitation status	NVD · CVE.org

Recent advisories for Copilot Chat

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-65675: No cwe for this issue in Visual Studio Code CoPilot Chat Extension allows an unauthorized atta…nvd · 2026-08-11
highCVE-2026-65675: CoPilot Chat Security Feature Bypass Vulnerabilitymsrc · 2026-08-11
mediumCVE-2026-50519: Microsoft Visual Studio Code CoPilot Chat Security Feature Bypass Vulnerabilitymsrc · 2026-06-09
highCVE-2026-45482: Microsoft Visual Studio Code CoPilot Chat Security Feature Bypass Vulnerabilitymsrc · 2026-06-09
highCVE-2026-47645: Microsoft 365 Copilot's Business Chat Elevation of Privilege Vulnerabilitymsrc · 2026-06-09