CVE-2026-63520: CWE-20: Improper Input Validation in Microsoft Microsoft SharePoint Enterprise Server 2016
Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-63520) involves improper input validation in Microsoft Office SharePoint Enterprise Server 2016, which could allow an unauthenticated attacker to execute arbitrary code remotely. The CVSS 3.1 base score is 8.1, indicating high severity, with network attack vector, high impact on confidentiality, integrity, and availability, and requiring no privileges or user interaction. Microsoft has released an official fix for this vulnerability as documented in their security update guide.
Potential Impact
Successful exploitation can lead to remote code execution by an unauthorized attacker, potentially compromising the confidentiality, integrity, and availability of the affected SharePoint server. This could allow attackers to execute arbitrary commands or code remotely without authentication.
Mitigation Recommendations
An official fix is available from Microsoft. Administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63520 to remediate this vulnerability.
CVE-2026-63520: CWE-20: Improper Input Validation in Microsoft Microsoft SharePoint Enterprise Server 2016
Description
Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
CVSS v3.1
Score 8.1high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-63520) involves improper input validation in Microsoft Office SharePoint Enterprise Server 2016, which could allow an unauthenticated attacker to execute arbitrary code remotely. The CVSS 3.1 base score is 8.1, indicating high severity, with network attack vector, high impact on confidentiality, integrity, and availability, and requiring no privileges or user interaction. Microsoft has released an official fix for this vulnerability as documented in their security update guide.
Potential Impact
Successful exploitation can lead to remote code execution by an unauthorized attacker, potentially compromising the confidentiality, integrity, and availability of the affected SharePoint server. This could allow attackers to execute arbitrary commands or code remotely without authentication.
Mitigation Recommendations
An official fix is available from Microsoft. Administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63520 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-16T22:05:22.740Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63520","vendor":"Microsoft"}]
Threat ID: 6a7b5826bf8831d53915626b
Added to database: 08/11/2026, 17:13:10 UTC
Last enriched: 08/11/2026, 20:41:49 UTC
Last updated: 08/12/2026, 02:46:30 UTC
Views: 8
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.