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CVE-2026-56191

critical · 10

Improper authentication in Microsoft Exchange Online allows an unauthorized attacker to perform tampering over a network.

10
CVSS
0.8%
EPSS (exploit prob.)
54th
EPSS percentile
2026-07-24
Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weaknesses

CWE-287

Affected products

VendorProductAffected versions
microsoftexchange_onlineall versions

Check a specific version with /api/v1/cve/match.

References

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-56191