CVE-2026-56191 PUBLISHED

Microsoft Exchange Online Tampering Vulnerability

Assigner: microsoft
Reserved: 19.06.2026 Published: 24.07.2026 Updated: 24.07.2026

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

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
CVSS Score: 10

Product Status

Vendor Microsoft
Product Microsoft Exchange Online
Versions
  • Version - is affected

References

Problem Types