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CVE-2026-56191 is a critical severity vulnerability with a CVSS score of 10.0. No known exploits currently, and patches are available.
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Lower probability of exploitation
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
Improper authentication in Microsoft Exchange Online allows an unauthorized attacker to perform tampering over a network.
| Vendor | Product |
|---|---|
| Microsoft | Exchange Online |