# CVE-2026-77903

Auth bypass in Microsoft Dataverse enabling remote privilege escalation.

- Page: https://www.vulneraibility.com/cve/CVE-2026-77903
- CVSS: 9.0
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 0.37% (percentile 31.2)
- CISA SSVC: exploitation none, automatable no, technical impact total (assessed 2026-09-18)
- Weakness: CWE-290
- Published: 2026-09-17

## Affected

- Microsoft Dataverse
- Power Platform environments
- Dynamics 365 instances using Dataverse

## Impact

Authentication spoofing allows remote privilege escalation, unauthorized data access/modification, and role/session takeover.

## Action

Immediate action required

## Recommendation

Apply vendor patch immediately; enforce MFA; review/revoke sessions and audit logs.

## References

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

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.