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

Critical CVSS 10.0
CVECVE-2026-56191
First seen2026-07-29 15:15 UTC
Disclosed2026-07-24 01:17 UTC
Last updated2026-07-29 15:15 UTC
Channel statusauto

Summary

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

In-depth triage · Auto channel

No in-depth report has been generated yet (DR-003 v2 AI pipeline is under construction).

Affected products

  • :

Sources

  • NVD DATABASE

Original Links

Timeline

  1. nvd_ingest NVD