Security readout for executives and security teams
Plain-English summary
CVE-2020-0894 is a medium-severity Microsoft SharePoint cross-site scripting issue. An authenticated user could send a crafted request that SharePoint fails to sanitize, potentially causing another user to run attacker-controlled script in a SharePoint context. Business risk depends on exposed SharePoint use and user interaction.
Executive priority
Treat this as a moderate-priority SharePoint hygiene issue. It is not documented here as actively exploited, but affected collaboration platforms can amplify phishing and trust abuse. Remediate based on exposure and user population.
Technical view
The issue is CWE-79 XSS in Microsoft SharePoint products. CVSS 3.1 is 5.4: network reachable, low complexity, low privileges required, user interaction required, changed scope, low confidentiality and integrity impact, no availability impact. It is distinct from CVE-2020-0893.
Likely exposure
Exposure is likely where affected SharePoint Enterprise Server 2016, SharePoint Server 2019, or SharePoint Foundation 2010 SP2/2013 SP1 are deployed, especially if reachable by many internal users or externally accessible authenticated users.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not marked KEV. Exploitation requires low privileges and user interaction, so risk is lower than unauthenticated server compromise but still relevant for phishing, session misuse, or content manipulation scenarios.
Researcher notes
Evidence supports an authenticated, user-interaction XSS class issue only. The source bundle does not identify stored versus reflected behavior, affected endpoints, exploit details, or specific fixed builds. Avoid assuming exploitability beyond the CVSS vector and Microsoft/CVE descriptions.
Mitigation direction
- Review Microsoft MSRC advisory CVE-2020-0894 for vendor guidance and applicable updates.
- Inventory affected SharePoint versions across production, staging, and legacy environments.
- Prioritize remediation for internet-facing or broadly accessible SharePoint deployments.
- Restrict access to affected SharePoint instances while remediation is pending.
- Train users to report unexpected SharePoint prompts, links, or embedded content.
Validation and detection
- Confirm whether any listed SharePoint versions exist in the environment.
- Compare installed SharePoint build levels with Microsoft MSRC guidance for CVE-2020-0894.
- Check whether affected sites are externally reachable or limited to trusted networks.
- Review SharePoint logs for suspicious crafted requests or unusual user-driven content changes.
- Verify remediation through approved vulnerability scanning or configuration evidence.
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-2020-0894 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-2020-0894CVE 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.