Microsoft SharePoint Server: Information disclosure through improper input validation
Summary
Improper input validation in Microsoft SharePoint Server Subscription Edition allows an authorized attacker to disclose information over the network. The attacker needs a valid low-privilege account, but no user interaction is required, and the impact is limited to confidentiality (CVSS 6.5, Medium). The CVE text says "Office SharePoint", while the CNA data and CPE name SharePoint Server, so the SharePoint Server line is treated as the target. No exploitation is known.
Affected
- Microsoft SharePoint Server Subscription Edition: 16.0.0 up to before 16.0.20326.20190
- Other SharePoint Server editions: Unknown.
Fixed in
- Microsoft SharePoint Server Subscription Edition: 16.0.20326.20190 or later
- A related update is listed as KB5002927 in a mirror; not verified against Microsoft.
Workaround
Unknown.
Exploitation
- No evidence of exploitation in the wild; not listed in CISA KEV.
- CISA SSVC: exploitation none, not automatable.
- VulDB reports no public exploit, but also carries a "0-Day" label; this conflict is unresolved.
- EPSS score about 0.01.
Our recommendation
- Update SharePoint Server Subscription Edition to 16.0.20326.20190 or later as a priority.
- Check whether other SharePoint Server editions are in use and whether they are affected (check MSRC directly).
- Review accounts with access to SharePoint, and disable unused or external accounts.
- Prioritise this higher if the server is reachable from the internet or allows external sharing.
Information from Microsoft (Patch Tuesday October 2026)
- Severity (Microsoft)
- Important
- Impact
- Information disclosure – 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-2026-105719 msrc.microsoft.com
- NVD mirror (Vulners): CVE-2026-105719 vulners.com
- CNA data (Vulners CVELIST): CVE-2026-105719 vulners.com
- VulDB: CVE-2026-105719 vuldb.com
- Strix: CVE-2026-105719 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 5 Nov 2026, 11:32.
Original description (NVD)
Improper input validation in Microsoft Office SharePoint allows an authorized attacker to disclose information 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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