Security readout for executives and security teams
Plain-English summary
CVE-2020-0923 is a Microsoft SharePoint cross-site scripting issue. An attacker with some access could send a crafted web request that SharePoint fails to sanitize, potentially causing script execution in a user's browser. The business risk is moderate, focused on data exposure, session misuse, or unauthorized actions rather than server takeover.
Executive priority
Treat this as a moderate-priority SharePoint hygiene issue. It is not described as actively exploited in the provided sources, but affected SharePoint systems should be validated and updated because XSS can support credential, session, and user-trust abuse.
Technical view
The vulnerability is CWE-79 XSS in Microsoft SharePoint Server components caused by improper sanitization of a specially crafted web request. CVSS 3.1 is 5.4: network reachable, low complexity, low privileges required, user interaction required, changed scope, low confidentiality and integrity impact, and no availability impact.
Likely exposure
Exposure is likely limited to organizations running Microsoft SharePoint Enterprise Server 2016 or 2013 SP1, SharePoint Server 2019, or SharePoint Foundation 2013 SP1. Internet-facing, partner-facing, or broadly accessible SharePoint sites carry higher practical risk, especially where many authenticated users interact with shared content.
Exploitation context
The provided sources do not indicate active exploitation, and the CVE is not listed as KEV in the source bundle. The CVSS vector suggests exploitation requires network access, low privileges, and user interaction, so risk depends on authenticated access paths and the ability to influence a user session.
Researcher notes
Evidence is limited to the CVE description, CVSS vector, affected product list, KEV status, and Microsoft advisory reference. No exploit details, proof-of-concept status, specific patch identifiers, or operational indicators were provided in the source bundle.
Mitigation direction
- Check the Microsoft MSRC advisory for current security update guidance.
- Apply applicable Microsoft SharePoint security updates through normal change control.
- Prioritize internet-facing or partner-facing SharePoint deployments.
- Restrict SharePoint access to trusted users and networks where business allows.
Validation and detection
- Inventory SharePoint Server and Foundation versions across the environment.
- Confirm whether listed affected versions are present.
- Compare installed SharePoint updates against Microsoft MSRC guidance.
- Review exposure of SharePoint sites to external or broad internal users.
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-2020-0923 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-2020-0923CVE 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.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.