Security readout for executives and security teams
Plain-English summary
CVE-2020-1106 is a Microsoft SharePoint cross-site scripting flaw. A crafted request to an affected SharePoint server could cause script execution in a user’s browser. Business impact is mainly data exposure or unauthorized actions in the context of a targeted user, not server takeover.
Executive priority
Treat as a moderate priority patch and exposure-management item. Prioritize externally reachable or heavily used SharePoint environments, but do not treat it as confirmed actively exploited based on the provided evidence.
Technical view
The issue is CWE-79 XSS in Microsoft SharePoint request sanitization. CVSS 3.1 is 5.4: network attack vector, low complexity, low privileges required, user interaction required, changed scope, low confidentiality and integrity impact, no availability impact.
Likely exposure
Exposure is limited to organizations running affected SharePoint Foundation 2013 SP1, SharePoint Enterprise Server 2016, or SharePoint Server 2019, especially where authenticated users can reach vulnerable SharePoint sites.
Exploitation context
The provided bundle marks KEV as false and includes no cited evidence of active exploitation. CVSS indicates exploitation requires network reachability, low privileges, and user interaction, so urgency depends on exposed SharePoint access and user population.
Researcher notes
The source bundle gives CVSS, affected products, CWE-79 classification, and references, but not detailed vulnerable endpoints or proof-of-concept behavior. Keep validation non-invasive and anchor remediation to Microsoft guidance.
Mitigation direction
- Review Microsoft MSRC guidance for CVE-2020-1106 and applicable SharePoint updates.
- Apply vendor-supported SharePoint security updates after compatibility testing.
- Restrict SharePoint access to trusted users and networks where operationally feasible.
- Use least privilege for SharePoint accounts and site permissions.
- Monitor vendor advisories for any changed exploitation or remediation guidance.
Validation and detection
- Inventory SharePoint Foundation 2013 SP1, Enterprise Server 2016, and Server 2019 deployments.
- Compare installed SharePoint build levels against Microsoft’s CVE-2020-1106 advisory.
- Identify internet-facing or broadly accessible affected SharePoint sites.
- Confirm whether low-privileged users can access vulnerable SharePoint surfaces.
- Review web and SharePoint logs for unusual scripted requests or XSS indicators.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-1106 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N2.32.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1106CVE reference · x_refsource_MISC
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1106CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.