365 Copilot
CVE-2026-24307
CRITICAL
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Lifecycle Timeline
2DescriptionCVE.org
Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information over a network.
AnalysisAI
M365 Copilot has an input validation vulnerability allowing unauthorized attackers to extract sensitive information through crafted prompts over the network.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | M365 Copilot enabled in target environment with default input validation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 9.3, EPSS 0.15%. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker sends a crafted message or document that, when processed by M365 Copilot, triggers the validation bypass and causes the AI to disclose sensitive information from the victim's mailbox, SharePoint sites, or Teams conversations. |
| Remediation | Microsoft has released updates. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Audit M365 Copilot access logs and user activity for suspicious queries or data exfiltration patterns; escalate to incident response if compromise is suspected. …
Sign in for detailed remediation steps and compensating controls.
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External POC / Exploit Code
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