Security readout for executives and security teams
Plain-English summary
This is a medium-severity cross-site scripting issue in Microsoft SharePoint. An attacker with low-privileged access could send a crafted request that SharePoint fails to sanitize, potentially causing another user to run attacker-controlled script in their browser.
Executive priority
Treat this as a scheduled remediation item, not an emergency unless affected SharePoint is broadly exposed or high-value. Prioritize patch verification and access reduction because XSS can support credential theft, session abuse, or misleading content inside trusted SharePoint workflows.
Technical view
CVE-2020-0693 is a CWE-79 XSS vulnerability in Microsoft SharePoint Server sanitization of specially crafted web requests. 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.
Likely exposure
Exposure is most likely in organizations running SharePoint Server 2019, SharePoint Server 2013 Service Pack 1, or SharePoint Enterprise Server 2016, especially user-accessible or internet-facing SharePoint sites. The provided sources do not identify SharePoint Online as affected.
Exploitation context
The provided data does not show known active exploitation, and this CVE is not listed as KEV. Exploitation requires low privileges and user interaction, so risk depends on attacker access, affected SharePoint exposure, and whether users can be induced to interact with malicious content.
Researcher notes
Key constraints are PR:L and UI:R. The vulnerability has changed scope with low confidentiality and integrity impact and no availability impact. The CVE is distinct from CVE-2020-0694. The source bundle does not provide exploit details, KB numbers, or compensating controls beyond vendor guidance.
Mitigation direction
- Check Microsoft MSRC guidance for CVE-2020-0693 and apply the vendor-recommended update.
- Inventory SharePoint Server 2013 SP1, 2016 Enterprise, and 2019 deployments.
- Limit external access to affected SharePoint sites where business requirements allow.
- Review SharePoint permissions and reduce unnecessary low-privileged accounts.
- Monitor SharePoint logs and browser security alerts for suspicious script activity.
Validation and detection
- Confirm each SharePoint farm version and patch level against Microsoft guidance.
- Verify affected public routes are known and protected by expected authentication controls.
- Check whether any affected servers remain internet-facing after mitigation.
- Review recent SharePoint web logs for abnormal crafted requests or XSS-related alerts.
- Retest sanitization behavior using approved, non-offensive validation procedures.
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-2020-0693 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-2020-0693CVE 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.