CVE-2026-77903 Microsoft Dataverse Elevation of Privilege Vulnerability

Critical 9.0 Published 17 Sep 2026 Updated 26 Oct 2026

An attacker can bypass authentication via spoofing to elevate privileges in Microsoft Dataverse, requiring immediate patching.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-77903?

CVE-2026-77903 is a critical authentication bypass vulnerability in Microsoft Dataverse, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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

Weakness: CWE-290

Which versions are affected by CVE-2026-77903?

It affects 1 product.

Products include Microsoft Dataverse.

How do I fix CVE-2026-77903?

No fix has been published for CVE-2026-77903 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-77903 being exploited?

There is no known exploitation of CVE-2026-77903 in the wild and no public exploit code.

Sources

Also known as GHSA-7f9r-6785-2v6v.