CVE-2026-77903 — CRITICAL (9.0)

Vulnerability Description

Authentication bypass by spoofing in Microsoft Dataverse allows an unauthorized attacker to elevate privileges over a network.

CVSS Score

9.0

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Related Weaknesses (CWE)

CWE-290

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77903

FAQ

What is CVE-2026-77903?

CVE-2026-77903 is a vulnerability with a CVSS score of 9.0 (CRITICAL). Authentication bypass by spoofing in Microsoft Dataverse allows an unauthorized attacker to elevate privileges over a network.

How severe is CVE-2026-77903?

CVE-2026-77903 has been rated CRITICAL with a CVSS base score of 9.0/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-77903?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.