CVE-2026-77903: CWE-290: Authentication Bypass by Spoofing in Microsoft Microsoft Dataverse
Authentication bypass by spoofing in Microsoft Dataverse allows an unauthorized attacker to elevate privileges over a network.
AI Analysis
Technical Summary
This vulnerability in Microsoft Dataverse allows an attacker to bypass authentication mechanisms by spoofing, enabling privilege escalation over a network. The flaw is identified as CWE-290, indicating an authentication bypass issue. The CVSS 3.1 base score is 9.0, reflecting critical impact on confidentiality, integrity, and availability. Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker with network access to bypass authentication controls and gain elevated privileges within Microsoft Dataverse. This could lead to full compromise of data confidentiality, integrity, and availability within the affected environment.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the vendor-provided patch as soon as possible to remediate this vulnerability. Refer to the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77903 for detailed patching instructions.
CVE-2026-77903: CWE-290: Authentication Bypass by Spoofing in Microsoft Microsoft Dataverse
Description
Authentication bypass by spoofing in Microsoft Dataverse allows an unauthorized attacker to elevate privileges over a network.
CVSS v3.1
Score 9.0critical
Affected software
Microsoft
Microsoft Dataverse
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Microsoft Dataverse allows an attacker to bypass authentication mechanisms by spoofing, enabling privilege escalation over a network. The flaw is identified as CWE-290, indicating an authentication bypass issue. The CVSS 3.1 base score is 9.0, reflecting critical impact on confidentiality, integrity, and availability. Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker with network access to bypass authentication controls and gain elevated privileges within Microsoft Dataverse. This could lead to full compromise of data confidentiality, integrity, and availability within the affected environment.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the vendor-provided patch as soon as possible to remediate this vulnerability. Refer to the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77903 for detailed patching instructions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-21T17:26:55.613Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77903","vendor":"Microsoft"}]
Threat ID: 6aac71a655bf5e2cf50b5a68
Added to database: 09/17/2026, 23:03:02 UTC
Last enriched: 09/17/2026, 23:16:53 UTC
Last updated: 09/18/2026, 03:13:26 UTC
Views: 7
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