Security readout for executives and security teams
Plain-English summary
CVE-2020-0973 is a Microsoft SharePoint cross-site scripting issue. An authenticated attacker could craft a request that causes script to run in another user's browser if that user interacts with the affected server. Business impact is mainly account-context data exposure or unauthorized page actions, not server takeover.
Executive priority
Treat as a normal-priority SharePoint security update, escalated for externally reachable collaboration portals. It is not described as actively exploited, but XSS in SharePoint can still affect user trust, session context, and internal content workflows.
Technical view
The flaw is CWE-79 improper neutralization of input in Microsoft SharePoint. CVSS 3.1 is 5.4 with network attack vector, low attack complexity, low privileges required, user interaction required, changed scope, low confidentiality and integrity impact, and no availability impact.
Likely exposure
Exposure is limited to organizations running affected on-premises SharePoint versions: SharePoint Enterprise Server 2016 or 2013 SP1, and SharePoint Server 2019 or 2010 SP2. Systems accessible to many users or external collaborators carry higher practical risk.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not listed as KEV in the bundle. Exploitation requires some privilege and victim interaction, which lowers urgency compared with unauthenticated remote code execution.
Researcher notes
Do not assume broader Microsoft 365 or unrelated SharePoint versions are affected from this bundle. The evidence identifies specific on-premises SharePoint releases and a sanitization failure in crafted web requests, but does not provide detailed vulnerable parameters, exploit status, or independent remediation steps.
Mitigation direction
- Review the MSRC advisory for the exact SharePoint update applicable to each server.
- Apply relevant Microsoft SharePoint security updates through normal maintenance processes.
- Prioritize internet-facing or partner-accessible SharePoint farms before internal-only systems.
- If patch timing is delayed, review vendor guidance for supported compensating controls.
Validation and detection
- Inventory SharePoint farms and confirm versions against the affected product list.
- Compare installed SharePoint patch levels with the MSRC CVE-2020-0973 advisory.
- Run authenticated vulnerability scanning configured for Microsoft SharePoint checks.
- Review change records to verify the relevant Microsoft update was installed successfully.
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-2020-0973 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-2020-0973CVE 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.