Microsoft Dataverse is a widely used enterprise platform; an authentication bypass enabling privilege escalation can lead to org-wide compromise and data access, meriting broad IT notification.
CVE-2026-77903
Auth bypass in Microsoft Dataverse enabling remote privilege escalation.
Is CVE-2026-77903 being exploited?
Not confirmed. CVE-2026-77903 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.37% probability of exploitation in the next 30 days.
How severe is CVE-2026-77903?
CVE-2026-77903 is rated Critical with a CVSS score of 9.0. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-77903?
Yes. A fix has been recorded for CVE-2026-77903. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-77903 affect?
CVE-2026-77903 affects Microsoft Dataverse, Power Platform environments, Dynamics 365 instances using Dataverse. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-77903?
Apply vendor patch immediately; enforce MFA; review/revoke sessions and audit logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authentication spoofing allows remote privilege escalation, unauthorized data access/modification, and role/session takeover.
Immediate action required
cisa ssvc
- exploitation
- none
- automatable
- no
- technical impact
- total
Assessed by CISA 18 Sept 2026 (SSVC 2.0.3).
timeline
- 17 Sept 2026Published
- 18 Sept 2026CISA SSVC assessment: exploitation none · same day later
- 19 Sept 2026Analysed by vulneraibility.com · 1 day later
- 31 Oct 2026CVE record last updated · 42 days later
- Patchmsrc.microsoft.com /update-guide/vulnerability/CVE-2026-77903
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.