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Sharepoint Enterprise ServerApplication · Microsoft

CVE-2020-1210

CRITICAL · 9.9 CVSS v3.1 Published 2020-09-11
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable Zero-click Patch available

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 · unedited
<p>A remote code execution vulnerability exists in Microsoft SharePoint when the software fails to check the source markup of an application package. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the SharePoint application pool and the SharePoint server farm account.</p> <p>Exploitation of this vulnerability requires that a user uploads a specially crafted SharePoint application package to an affected version of SharePoint.</p> <p>The security update addresses the vulnerability by correcting how SharePoint checks the source markup of application packages.</p>

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

A detailed technical summary for this CVE is being prepared.

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
Sharepoint Enterprise ServerApplication
Affected:= 2013= 2016
Sharepoint FoundationApplication
Affected:= 2010= 2013
Sharepoint ServerApplication
Affected:= 2019

CVSS 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
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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 · scoped
Patch available Apply the vendor patch
Vendor patch portal.msrc.microsoft.com →
Recommended fix High confidence

Apply Microsoft Security Update for CVE-2020-1210 (specific KB varies by SharePoint version - consult MSRC advisory)

  1. 1. Identify the specific SharePoint version and build number installed by going to Central Administration > System Settings > Manage servers in this farm
  2. 2. Navigate to the Microsoft Security Response Center portal at https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1210 to obtain the applicable security update KB number for your SharePoint version
  3. 3. Download the corresponding security update from the Microsoft Update Catalog or Microsoft Download Center
  4. 4. Ensure all SharePoint servers in the farm are backed up or at least the farm configuration is documented
  5. 5. Apply the security update to all SharePoint servers in the farm, following the standard SharePoint update process
  6. 6. Run the SharePoint Products Configuration Wizard (PSConfig) on each server after applying the update
  7. 7. Verify the update was successful by checking the build number matches the expected patched version
Caveat Standard SharePoint patching carries minimal risk but always backup farm configuration before applying updates; plan for maintenance window as farm will require downtime during PSConfig run

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2020-1210 in production — separate from our analysis above.

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What this is

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.

What belongs here
  • 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
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