Security readout for executives and security teams
Plain-English summary
CVE-2019-0831 is a SharePoint cross-site scripting issue. A logged-in attacker could send a crafted request that SharePoint fails to sanitize, potentially causing script execution in another user’s browser. The expected business impact is limited confidentiality and integrity risk, not service outage.
Executive priority
Treat this as a moderate-priority SharePoint maintenance risk. It is not reported as actively exploited in the supplied evidence, but SharePoint often holds sensitive business content, so unremediated affected systems should be addressed in routine patch cycles.
Technical view
The CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N. Sources describe improper sanitization of a specially crafted web request in affected Microsoft SharePoint products. The issue is CWE-79 XSS and is distinct from CVE-2019-0830.
Likely exposure
Exposure is most likely in organizations running the listed SharePoint Server, Foundation, or Enterprise Server versions, especially where authenticated users can interact with SharePoint content. The bundle does not identify specific configurations, endpoints, or deployment modes beyond affected product versions.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation evidence. CVSS indicates network access, low privileges, and user interaction are required, with changed scope and limited confidentiality and integrity impact.
Researcher notes
Evidence is limited to public CVE/MSRC metadata. The bundle does not provide endpoint details, proof-of-concept status, exploit maturity, or named mitigations. Avoid assuming exploitation or fixes beyond vendor guidance.
Mitigation direction
- Inventory SharePoint versions against the affected Microsoft product list.
- Review the MSRC advisory for official remediation guidance.
- Apply Microsoft-supported security updates where applicable after normal change testing.
- Restrict SharePoint access to trusted users while remediation is pending.
- Prioritize environments with broad user access or sensitive content.
Validation and detection
- Confirm whether any affected SharePoint versions remain deployed.
- Check patch and update records against the MSRC advisory.
- Review SharePoint access patterns for broad authenticated-user exposure.
- Validate remediation in staging before production rollout.
- Monitor vendor guidance for any updated instructions.
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-2019-0831 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-2019-0831CVE 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.