Security readout for executives and security teams
Plain-English summary
CVE-2020-0926 is a Microsoft SharePoint cross-site scripting flaw. A user with some access could send a crafted web request that causes another user to interact with malicious script content. Business impact is mainly account/session abuse, data exposure, or content tampering inside SharePoint, not server takeover.
Executive priority
Moderate priority. Handle through normal vulnerability management, but accelerate for externally reachable SharePoint or environments with sensitive documents and many low-privilege users.
Technical view
The issue is CWE-79 in Microsoft SharePoint Enterprise Server 2013 SP1 and 2016, and SharePoint Server 2019. CVSS 3.1 is 5.4: network reachable, low complexity, low privileges required, user interaction required, scope changed, low confidentiality and integrity impact, no availability impact.
Likely exposure
Exposure is limited to organizations running the listed on-premises SharePoint versions. Risk rises where SharePoint is internet-facing, broadly accessible to many users, or used for sensitive collaboration workflows.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation evidence. The CVSS vector indicates exploitation requires low privileges and user interaction, so practical abuse depends on attacker access and a target user engaging with malicious content.
Researcher notes
This CVE is distinct from several related 2020 SharePoint XSS CVEs listed in the description. Evidence supports XSS classification and the CVSS constraints, but the prompt bundle does not include exploit examples, patch KB numbers, or observed exploitation.
Mitigation direction
- Review the Microsoft MSRC advisory for the official remediation path.
- Apply the SharePoint security updates or fixes listed by Microsoft.
- Inventory SharePoint 2013 SP1, 2016, and 2019 deployments.
- Prioritize internet-facing or high-sensitivity SharePoint farms.
- Monitor vendor guidance for any updated mitigation details.
Validation and detection
- Confirm deployed SharePoint versions against the affected product list.
- Verify installed updates match Microsoft guidance for CVE-2020-0926.
- Check vulnerability scanner results for CVE-2020-0926 closure.
- Review exposure of affected SharePoint sites to untrusted users.
- Document remediation evidence for each SharePoint farm.
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-2020-0926 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-2020-0926CVE 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.