Microsoft SharePoint Server: SQL injection leads to privilege escalation
Summary
A SQL injection flaw (CWE-89) in Microsoft Office SharePoint allows an authenticated attacker to elevate privileges over the network. Per the CVSS vector (8.8), low-privileged access is required and no user interaction is needed. The sources describe the issue for SharePoint Server Subscription Edition; no exploitation is known.
Affected
- Microsoft SharePoint Server Subscription Edition: 16.0.0 to before 16.0.20326.20190
- SharePoint 2016 and 2019: Unknown, verify on the MSRC product table
Fixed in
- SharePoint Server Subscription Edition: October 13, 2026 security update KB5002927 (build 16.0.20326.20190)
- Prerequisite: If SharePoint Workflow Manager is in use, install KB5002799 before the cumulative update
Workaround
Unknown. No vendor-published workaround found.
Exploitation
- Not listed in CISA KEV.
- CISA SSVC in the CVE record: exploitation none, automatable no.
- No confirmed in-the-wild exploitation reported; no public proof of concept found in our searches.
- EPSS values conflict (1.08% to 2.0%).
Our recommendation
- Confirm the SharePoint product and build on all farms.
- Patch Subscription Edition farms with KB5002927 after checking the Workflow Manager prerequisite and the folder permission note for farms on the September 2025 CU in the Gossner blog.
- Verify the status of SharePoint 2016 and 2019 on MSRC before assuming they are not affected.
- Review who holds SharePoint accounts and whether farms are reachable from the internet.
- Monitor CISA KEV and vendor updates.
Information from Microsoft (Patch Tuesday October 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Microsoft Office SharePoint
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Microsoft Office
- Updates (KB)
- KB5002927
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-70266 msrc.microsoft.com
- Microsoft Support: KB5002927 SharePoint hotfix support.microsoft.com
- Stefan Gossner: SharePoint security fixes released with October 2026 PU blog.stefan-gossner.com
- Senserva: KB5002927 overview senserva.com
- OpenCVE: CVE-2026-70266 app.opencve.io
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 31 Oct 2026, 18:46.
Original description (NVD)
Improper neutralization of special elements used in an sql command ('sql injection') in Microsoft Office SharePoint allows an authorized attacker to elevate privileges 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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