Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-77903

CVE-2026-77903HIGH

Microsoft Dataverse Elevation of Privilege Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   H   N   N  U  H  H  H    8.1   .0037   28.9     —

AFFECTED
  Product              Versions  Fixed
  Microsoft Dataverse  - –       —

TIMELINE
  Aug 21  Reserved by microsoft
  Sep 17  Published (CNA: microsoft)
  Sep 25  RESCORED — CVE-2026-77903 (Microsoft Dataverse). CVSS 9 → 8.1 (NVD).

CWE-290 · CNA: microsoft · CVSS v3.1 · 1 reference · NVD status: Analyzed

Description

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

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
August 21, 2026	Reserved	Reserved by microsoft
September 17, 2026	Published	Published (CNA: microsoft)
September 25, 2026	RESCORED	RESCORED — CVE-2026-77903 (Microsoft Dataverse). CVSS 9 → 8.1 (NVD).

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Microsoft Dataverse	—	-	—

Weaknesses

CWE-290

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77903 [vendor-advisory, patch]

Authoritative record: CVE-2026-77903 at cve.org

Vendors: microsoft

Weaknesses: CWE-290

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-77903 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.