Authenticated disclosure of sensitive information
Published Jul 14, 2021 · Updated Aug 10, 2026
Information disclosure in Microsoft SharePoint Server 2013 and 2016 allows remote authenticated users to read sensitive data. Microsoft has not disclosed the affected component or the operation that exposes the data; ZDI separately describes a missing integrity check in SharePoint Help updates. Exploitation requires low-privileged access and high attack complexity, and Microsoft's assessment limits the direct impact to confidentiality.
Summary
What happened
Information disclosure in Microsoft SharePoint Server 2013 and 2016 allows remote authenticated users to read sensitive data. Microsoft has not disclosed the affected component or the operation that exposes the data; ZDI separately describes a missing integrity check in SharePoint Help updates. Exploitation requires low-privileged access and high attack complexity, and Microsoft's assessment limits the direct impact to confidentiality.
The record
- CVE
- CVE-2021-34519
- Published
- Jul 14, 2021
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Microsoft SharePoint Foundation 2013
- Classifications
- T1557
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 14, 2021CVE publishedPublication date reported by the CVE source.
- Aug 10, 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=15.0.0 <15.0.5363.1000
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.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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