CVE-2026-26106
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedImproper input validation in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThis is an improper input validation vulnerability in Microsoft Office SharePoint that allows an authenticated (authorized) attacker to achieve remote code execution (RCE) over the network. The vulnerability stems from insufficient validation of user-supplied input, enabling attackers to inject malicious code that is subsequently executed by the SharePoint server.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 16.0.19725.20076= 2016= 2019CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify SharePoint Server versionOpen SharePoint Management Shell and run: (Get-SPFarm).BuildVersion or check Central Administration > System Settings > Manage farm configurationAffected if version is 2016, 2019, or any version lower than 16.0.19725.20076
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Confirm SharePoint Server editionVerify the installation is Microsoft SharePoint Server (on-premises) rather than SharePoint Online (cloud) by checking in Central Administration under System Settings > Convert server role or by running Get-SPProductInfo in PowerShellAffected if running SharePoint Server 2016 or 2019 on-premises
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Check SharePoint web application accessibilityVerify SharePoint web applications are accessible over the network by reviewing IIS bindings and firewall rules, or by accessing the SharePoint site URL from a browserAffected if SharePoint is reachable over the network without additional authentication barriers
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Review SharePoint authentication configurationExamine authentication providers in Central Administration > Web Applications > Authentication Providers to confirm authentication methods are properly configuredAffected if authentication is enabled but the version is vulnerable
Your environment is affected if you are running SharePoint Server 2016 or 2019, or any version prior to 16.0.19725.20076, and the server is accessible over the network to authenticated users.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor data16.0.19725.20076
Apply Microsoft security patches for SharePoint as soon as they become available; in the interim, restrict SharePoint access to authorized users only and monitor for suspicious input patterns or unusual execution behavior.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-26106 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-26106 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data