CVE-2026-56191

Summary

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

Affected Software

Weaknesses

• CWE-287: CWE-287: Improper Authentication

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: total

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56191

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