CVE-2026-55051
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 · uneditedServer-side request forgery (ssrf) in Microsoft Office SharePoint allows an authorized attacker to disclose information over a network.
In the news
Third-party coverage- Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days
- Microsoft CVE Summary - Bleeping Computer
Surfaced from public web coverage — external links open in a new tab.
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 confidenceServer-side request forgery (SSRF) vulnerability in Microsoft Office SharePoint allows an authorized attacker to make the server perform arbitrary network requests to internal systems or external resources, potentially disclosing sensitive information or performing reconnaissance.
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< 16.0.19725.20434= 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
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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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Retrieve SharePoint Server build versionOpen SharePoint Management Shell and run: (Get-SPFarm).BuildVersion or Get-SPServer -Identity $env:COMPUTERNAME | Select-Object BuildVersionAffected if The returned build number is less than 16.0.19725.20434, or the version corresponds to SharePoint 2016 or 2019 (major version 16.0.xxxx) and is not patched to 16.0.19725.20434 or higher
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Check SharePoint farm patch levelIn SharePoint Central Administration, go to Check Product and Patch Installation Status under Upgrade and Migration, or run Get-SPProduct -Local in PowerShell to list all installed updatesAffected if The installed patches do not include version 16.0.19725.20434 or newer for SharePoint Server 2016/2019
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Identify SharePoint edition and versionRun Get-SPFarm | Select-Object Version, Build to get the exact build number, then cross-reference with Microsoft version docs to confirm if it is 2016 (16.0.xxxx.5000 range) or 2019 (16.0.xxxx.6000 range)Affected if The farm is running SharePoint 2016 or 2019 and the build is below 16.0.19725.20434
Your environment is affected if SharePoint Server 2016 or 2019 is running with a build version lower than 16.0.19725.20434, as this SSRF vulnerability can be exploited by an authorized attacker.
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.
dbcve · scoped16.0.19725.20434
Implement strict URL allowlist validation for any user-controllable URL parameters in SharePoint; apply network segmentation to restrict SharePoint server outbound network access to only necessary endpoints.
SharePoint Server 2016/2019 to version 16.0.19725.20434 or later
- Identify current SharePoint Server build version using SharePoint Administration Center or Get-SPProductVersion PowerShell cmdlet
- Review Microsoft Security Response Center (msrc.microsoft.com) for the specific security bulletin associated with this vulnerability
- Apply the relevant SharePoint Server security update or upgrade to version 16.0.19725.20434 or later
- After applying the update, verify the version has been updated using Get-SPProductVersion
- Test critical SharePoint workflows to ensure functionality is maintained post-update
- Validate that the SSRF vulnerability is remediated by reviewing server logs and network configurations
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,720.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-55051 — 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-2026-55051 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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