CVE-2026-55020: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Microsoft Microsoft SharePoint Enterprise Server 2016
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
AI Analysis
Technical Summary
This vulnerability (CWE-79) in Microsoft SharePoint Enterprise Server 2016 (version 16.0.0) arises from improper neutralization of input during web page generation, which can lead to cross-site scripting attacks. An attacker with authorized access could exploit this flaw to perform spoofing attacks over a network. The CVSS 3.1 base score is 4.6 (medium severity), reflecting low confidentiality and integrity impact with no availability impact. Microsoft has published an official fix for this vulnerability.
Potential Impact
An authorized attacker could exploit this vulnerability to conduct spoofing attacks, potentially misleading users or systems by injecting malicious scripts. The impact on confidentiality and integrity is low, and there is no impact on availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users of Microsoft SharePoint Enterprise Server 2016 version 16.0.0 should apply the vendor-provided patch as soon as possible. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55020 for detailed remediation instructions.
CVE-2026-55020: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Microsoft Microsoft SharePoint Enterprise Server 2016
Description
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
CVSS v3.1
Score 4.6medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-79) in Microsoft SharePoint Enterprise Server 2016 (version 16.0.0) arises from improper neutralization of input during web page generation, which can lead to cross-site scripting attacks. An attacker with authorized access could exploit this flaw to perform spoofing attacks over a network. The CVSS 3.1 base score is 4.6 (medium severity), reflecting low confidentiality and integrity impact with no availability impact. Microsoft has published an official fix for this vulnerability.
Potential Impact
An authorized attacker could exploit this vulnerability to conduct spoofing attacks, potentially misleading users or systems by injecting malicious scripts. The impact on confidentiality and integrity is low, and there is no impact on availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users of Microsoft SharePoint Enterprise Server 2016 version 16.0.0 should apply the vendor-provided patch as soon as possible. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55020 for detailed remediation instructions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-16T14:12:44.284Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55020","vendor":"Microsoft"}]
Threat ID: 6a5676af68715ace43f09876
Added to database: 07/14/2026, 17:49:35 UTC
Last enriched: 08/13/2026, 15:29:44 UTC
Last updated: 08/27/2026, 11:04:01 UTC
Views: 49
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.