CVE-2026-50522: CWE-502: Deserialization of Untrusted Data in Microsoft Microsoft SharePoint Enterprise Server 2016
CVE-2026-50522 is a critical vulnerability in Microsoft SharePoint Enterprise Server 2016 involving deserialization of untrusted data. This flaw allows an unauthorized attacker to execute arbitrary code remotely without user interaction or privileges. The vulnerability has a CVSS score of 9.8, indicating a high impact on confidentiality, integrity, and availability. An official fix is available from Microsoft to remediate this issue.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-50522) in Microsoft SharePoint Enterprise Server 2016 is caused by improper handling of untrusted serialized data, classified under CWE-502. Exploitation enables remote code execution by an unauthenticated attacker over the network. The CVSS 3.1 vector indicates the attack requires no privileges or user interaction and affects confidentiality, integrity, and availability with high severity. Microsoft has released an official patch to address this vulnerability.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code remotely on the affected SharePoint server, potentially leading to full system compromise. The vulnerability impacts confidentiality, integrity, and availability of the system, making it critical to remediate.
Mitigation Recommendations
An official fix is available from Microsoft for this vulnerability. It is recommended to apply the provided patch promptly to mitigate the risk. No additional mitigation steps are indicated beyond applying the official update.
CVE-2026-50522: CWE-502: Deserialization of Untrusted Data in Microsoft Microsoft SharePoint Enterprise Server 2016
Description
CVE-2026-50522 is a critical vulnerability in Microsoft SharePoint Enterprise Server 2016 involving deserialization of untrusted data. This flaw allows an unauthorized attacker to execute arbitrary code remotely without user interaction or privileges. The vulnerability has a CVSS score of 9.8, indicating a high impact on confidentiality, integrity, and availability. An official fix is available from Microsoft to remediate this issue.
CVSS v3.1
Score 9.8critical
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-50522) in Microsoft SharePoint Enterprise Server 2016 is caused by improper handling of untrusted serialized data, classified under CWE-502. Exploitation enables remote code execution by an unauthenticated attacker over the network. The CVSS 3.1 vector indicates the attack requires no privileges or user interaction and affects confidentiality, integrity, and availability with high severity. Microsoft has released an official patch to address this vulnerability.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code remotely on the affected SharePoint server, potentially leading to full system compromise. The vulnerability impacts confidentiality, integrity, and availability of the system, making it critical to remediate.
Mitigation Recommendations
An official fix is available from Microsoft for this vulnerability. It is recommended to apply the provided patch promptly to mitigate the risk. No additional mitigation steps are indicated beyond applying the official update.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-ww8x-9jc5-9v7f
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-50522"]
- Database Specific Severity
- CRITICAL
- Cvss Version
- 3.1
- Remediation Level
- official-fix
- State
- PUBLISHED
Threat ID: 6a6150e79c2644c7f8da2030
Added to database: 07/22/2026, 23:23:19 UTC
Last enriched: 09/12/2026, 09:16:39 UTC
Last updated: 09/14/2026, 22:01:35 UTC
Views: 22
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.
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.