Authenticated content spoofing via undisclosed access control
Published Jul 14, 2026 · Updated Jul 14, 2026
Improper access control in Microsoft SharePoint Server allows remote authenticated users to spoof content over a network. Microsoft has not published the affected request path or the access-control operation that mishandles authenticated input. A low-privileged account and network access are required; exploitation can expose limited information and alter trusted content, but cannot interrupt service.
Summary
What happened
Improper access control in Microsoft SharePoint Server allows remote authenticated users to spoof content over a network. Microsoft has not published the affected request path or the access-control operation that mishandles authenticated input. A low-privileged account and network access are required; exploitation can expose limited information and alter trusted content, but cannot interrupt service.
The record
- CVE
- CVE-2026-56157
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- Microsoft
- Product
- Microsoft SharePoint Enterprise Server 2016
- Classifications
- CWE-284
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 14, 2026CVE publishedPublication date reported by the CVE source.
- Jul 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=16.0.0 <16.0.5561.1001
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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