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CVE-2026-42824: M365 Copilot Information Disclosure Vulnerability

mediumCVSS 6.5CVE-2026-42824
Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.

CSIRTS triage

vendor: Microsoftproduct: M365 CopilotInformation disclosure
What
Missing authentication for a critical function allows unauthorized information disclosure over a network.
Who is affected
Users of M365 Copilot with the vulnerability present.
Urgency
Remediation is medium urgency due to the potential for information disclosure.
Action
Apply the latest security updates for M365 Copilot.

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-2026-42824

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-42824coverage & exploitation statusNVD · CVE.org

Recent advisories for M365 Copilot Information

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.

More from Microsoft Security Response Center