CVE-2026-47638
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 neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing 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 confidenceCross-site scripting (XSS) vulnerability in Microsoft Office SharePoint allowing an authenticated attacker to inject malicious scripts into web pages, enabling session hijacking, credential theft, or spoofing of legitimate content. The vulnerability stems from improper input neutralization during web page generation.
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< 16.0.19725.20384= 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
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
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 installation and versionOpen SharePoint Central Administration > System Settings > Manage farm servers, or run PowerShell command: (Get-SPFarm).BuildVersion to retrieve the exact build version.Affected if The build version is lower than 16.0.19725.20384, or the version corresponds to SharePoint Server 2016 or 2019.
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Confirm SharePoint web applications are accessibleCheck that SharePoint web applications are published in IIS and accessible via browser. Verify authentication is enabled for these sites.Affected if SharePoint sites are accessible to authenticated users, as the XSS requires an authenticated attacker to inject scripts.
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Identify custom or third-party web parts that accept user inputReview installed web parts and features via SharePoint Management Shell: Get-SPWebTemplate | Select-Object Name,Id. Check for custom solutions that may render user-supplied data.Affected if User input fields, custom web parts, or list forms that render content without encoding are present in the SharePoint environment.
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Audit SharePoint permissions and authentication configurationReview authentication providers in Central Administration > Application Management > Manage web applications > Authentication Providers. Verify which user accounts have access.Affected if The environment allows authenticated users (including low-privilege users) to create or modify content that could be rendered by other users.
Your environment is affected if SharePoint Server is version 2016, 2019, or running a build earlier than 16.0.19725.20384, and authenticated users can submit or modify content that gets rendered in SharePoint pages.
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 data16.0.19725.20384
Apply Microsoft security patches for SharePoint when available; implement output encoding and input validation for user-supplied content; review and restrict SharePoint permissions for authorized users.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-47638 — 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-2026-47638 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