CVE-2026-24307: Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information o
criticalvulnerabilityLLM-Specific
security
Summary
CVE-2026-24307 is a vulnerability in Microsoft 365 Copilot where improper validation of input (failure to check that data matches what the system expects) allows an attacker to access and disclose information over a network without authorization. The vulnerability has a CVSS score of 4.0 (a moderate severity rating on a 0-10 scale).
Vulnerability Details
CVSS Score
9.3(critical)
EPSS (30-day exploit probability)
EPSS: 0.1%
Classification
Attack Type
Data Extraction
Attack SophisticationModerate
Impact (CIA+S)
confidentiality
AI Component TargetedAPI
Taxonomy References
CWE (Weakness Type)
Affected Vendors
Microsoft
Related Issues
Monthly digest — independent AI security research
Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-24307
First tracked: February 15, 2026 at 08:51 PM
Classified by LLM (prompt v3) · confidence: 85%