Microsoft SharePoint Server Subscription Edition: Elevation of privilege via SSRF
Summary
Microsoft SharePoint Server Subscription Edition contains a Server-Side Request Forgery (SSRF) vulnerability (CWE-918) that allows an authorized attacker to elevate privileges over the network. The attacker needs a low-privileged account and user interaction, so this is not an unauthenticated internet attack. CVSS 8.0 (High) with high impact on confidentiality, integrity and availability. Microsoft has released a fix with the November 2026 update.
Affected
- SharePoint Server Subscription Edition from 16.0.0 before 16.0.20326.20278
- SharePoint 2019 and 2016: Unknown, check the MSRC advisory
Fixed in
- SharePoint Server Subscription Edition build 16.0.20326.20278 or later (KB 5002945, November 2026 CU)
- Not yet verified against the MSRC advisory
Workaround
Unknown. A patch is available, so no workaround is needed.
- CISA advises not exposing SharePoint servers directly to the internet (general hardening, not specific to this CVE).
Exploitation
No evidence of exploitation in the wild or public proof of concept found.
- CISA SSVC: exploitation none, automatable no, technical impact total.
- A third-party aggregator lists it as not in KEV; verify in CISA's KEV catalogue.
Our recommendation
- Patch SharePoint Server Subscription Edition to 16.0.20326.20278 or later in the November 2026 cycle.
- Before installing, check the farm patch level and the fix procedure from the vendor source; test first.
- Confirm with MSRC whether SharePoint 2019 and 2016 are affected.
- Escalate if the server is internet-facing or has many external or guest accounts.
- Review SharePoint user accounts and watch for phishing that could give an attacker a valid account.
Information from Microsoft (Patch Tuesday November 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)
- KB5002945
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-111296 msrc.microsoft.com
- CVE.org CVE Record CVE-2026-111296 www.cve.org
- Stefan Gossner: SharePoint security fixes November 2026 blog.stefan-gossner.com
- CISA: SharePoint hardening alert (July 2026) www.cisa.gov
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 11 Nov 2026, 01:56.
Original description (NVD)
Server-side request forgery (ssrf) 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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