[NEW] [high] Microsoft 365 Copilot: Vulnerability Enables Information Disclosure

highpublic exploitCVE-2026-24301

A remote, anonymous attacker can exploit a vulnerability in Microsoft 365 Copilot to disclose information.

CSIRTS triage

vendor: Microsoft product: 365 Copilot Information disclosure

What: A vulnerability in Microsoft 365 Copilot allows remote unauthenticated attackers to disclose sensitive information.
Who is affected: Microsoft 365 Copilot deployments.
Urgency: High; information disclosure in Microsoft 365 may expose sensitive organizational or user data; remediate promptly.
Action: Apply security patches for Microsoft 365 Copilot.

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

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: high
Published: 2026-08-19
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2914

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.

Moderate exploitation riskCVE-2026-243011.6% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 74% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-24301	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Microsoft 365 Copilot

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.

high[NEW] [high] Microsoft Windows Terminal and 365 Copilot: Multiple Vulnerabilitiescert-bund · 2026-07-15
highCVE-2026-58617: Improper access control in Microsoft 365 Copilot for iOS allows an unauthorized attacker to el…nvd · 2026-07-14
criticalCVE-2026-41106: Microsoft 365 Copilot Elevation of Privilege Vulnerabilitymsrc · 2026-07-14
high[NEW] [high] Microsoft 365 Copilot: Vulnerability Allows Privilege Escalationcert-bund · 2026-07-03
highCVE-2026-47645: Microsoft 365 Copilot's Business Chat Elevation of Privilege Vulnerabilitymsrc · 2026-06-09