CVE-2026-42824
Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.
CSIRTS triage
- 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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Exploitation outlook
- Moderate exploitation risk7.6% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 94% of all EPSS-scored CVEs.
Advisory coverage (1)
- mediumCVE-2026-42824: M365 Copilot Information Disclosure Vulnerabilitymsrc · 2026-06-09
External references
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[](https://www.csirts.com/cve/CVE-2026-42824)