Microsoft Dataverse: Remote code execution via deserialization
Summary
Microsoft Dataverse, the data platform behind Microsoft business applications, contains a deserialization flaw (CWE-502) that allows deserialization of untrusted data. According to the CVSS vector, an unauthenticated attacker with network access could execute code without user interaction, with a CVSS base score of 9.8. Microsoft states that the vulnerability has already been fully mitigated on its side and that no customer action is required.
Affected
- Microsoft Dataverse (Microsoft-hosted service)
- Affected versions: Unknown. Microsoft's advisory lists no version information.
Fixed in
- Mitigated by Microsoft on the service side. No customer patch or fixed version is published.
Workaround
- No customer-side workaround is required according to Microsoft.
Exploitation
- Exploitation in the wild: Unknown. Microsoft's temporal vector shows exploit code maturity 'Unproven'.
- Public proof-of-concept: None found.
- CISA SSVC: Exploitation none, Automatable yes, Technical Impact total.
Our recommendation
- No action needed for Microsoft-hosted Dataverse use.
- Confirm with your Microsoft 365 or tenant administrator that no self-hosted or on-premises Dataverse component is in use.
- Monitor the MSRC advisory for revisions that could add customer-facing steps.
Information from Microsoft (Patch Tuesday October 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Response Center: CVE-2026-88131 msrc.microsoft.com
- Talos: Microsoft Patch Tuesday for October 2026 blog.talosintelligence.com
- VulDB: CVE-2026-88131 vuldb.com
- Positive Technologies: PT-2026-108300 vulners.com
- CIRCL: CVE-2026-88131 vulners.com
- Strix: CVE-2026-88131 www.strix.ai
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 30 Oct 2026, 20:07.
Original description (NVD)
Deserialization of untrusted data in Microsoft Dataverse allows an unauthorized attacker to execute code over a network.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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