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CVE-2026-62827· NVD / CVE Program· CNA microsoft

Microsoft SharePoint Server Elevation of Privilege Vulnerability

Improper authentication in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.

HighCVSS 8.8 · v3.1—No exploit Fix available

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Published
Aug 11, 2026
Updated
Sep 29, 2026
EPSS
0.9% · 59th percentile
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Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.9%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · microsoft
8.8
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
microsoftsharepoint server

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • microsoft sharepoint serverbefore 16.0.19725.20522
  • microsoft sharepoint server2016
  • microsoft sharepoint server2019

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

  • Microsoft Microsoft SharePoint Enterprise Server 2016

    • 16.0.0 and later · before 16.0.5565.1001affected

  • Microsoft Microsoft SharePoint Server 2019

    • 16.0.0 and later · before 16.0.10417.20198affected

  • Microsoft Microsoft SharePoint Server Subscription Edition

    • 16.0.0 and later · before 16.0.19725.20522affected

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-53770Microsoft SharePoint Server Remote Code Execution VulnerabilityKEV
    99Now
  • CVE-2023-29357Microsoft SharePoint Server Elevation of Privilege VulnerabilityKEV
    99Now
  • CVE-2025-49704Microsoft SharePoint Remote Code Execution VulnerabilityKEV
    95Now
  • CVE-2026-20963Microsoft SharePoint Remote Code Execution VulnerabilityKEV
    78This week
  • CVE-2026-58644Microsoft SharePoint Remote Code Execution VulnerabilityKEV
    74This week
  • CVE-2024-38094Microsoft SharePoint Remote Code Execution VulnerabilityKEV
    73This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Microsoft SharePoint Enterprise Server 201616.0.5565.1001 · KB5002905Microsoft (MSRC)
Microsoft SharePoint Server 201916.0.10417.20198 · KB5002894Microsoft (MSRC)
Microsoft SharePoint Server Subscription Edition16.0.19725.20522 · KB5002893Microsoft (MSRC)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-53771387 days apartMicrosoft SharePoint Server Spoofing Vulnerability
    56Plan

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

  • CVE-2026-668050 days apartMicrosoft SharePoint Server Remote Code Execution Vulnerability
    36Monitor
  • CVE-2026-703260 days apartMicrosoft SharePoint Server Elevation of Privilege Vulnerability
    35Monitor
  • CVE-2026-586390 days apartMicrosoft SharePoint Server Spoofing Vulnerability
    26Monitor
  • CVE-2026-628370 days apartMicrosoft SharePoint Server Information Disclosure Vulnerability
    26Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-287 · Improper Authentication

CVSS vector

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

nvd-secondary

Root cause

Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.

The bug in code

The whole CWE-287 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
app.use("/admin", requireSession, adminRouter);
// Route added later skips the middlewareapp.post("/admin-api/config", updateConfig);

Fixed

ts
const admin = express.Router();admin.use(requireSession, requireRole("admin"));
admin.post("/config", updateConfig);app.use("/admin", admin);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records