Security readout for executives and security teams
Plain-English summary
CVE-2019-0830 is a Microsoft SharePoint cross-site scripting issue. An attacker with low privileges could send a crafted web request that SharePoint fails to sanitize, potentially causing script execution in another user's browser after user interaction. Business impact is mainly confidentiality and integrity risk, not system outage.
Executive priority
Treat as a normal vulnerability management item with moderate priority. It is not identified as actively exploited in the provided sources, but affected SharePoint systems can hold sensitive collaboration data and should be brought in line with Microsoft guidance.
Technical view
The source describes CWE-79 in Microsoft SharePoint caused by improper sanitization of a specially crafted web request. 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 likely limited to environments running Microsoft SharePoint Foundation 2013 SP1, SharePoint Enterprise Server 2016, or SharePoint Server 2019 that have not followed Microsoft guidance for this CVE.
Exploitation context
The bundle does not cite known active exploitation, and KEV is false. Exploitation requires authenticated access and user interaction, which lowers urgency versus unauthenticated remote code execution but still matters for collaboration portals with sensitive users or data.
Researcher notes
Evidence is limited to the CVE description, CVSS vector, affected product list, CWE-79, and MSRC reference. No exploit details, proof-of-concept status, specific patch KB, or workaround text is included in the provided bundle.
Mitigation direction
- Identify affected SharePoint deployments and ownership.
- Check Microsoft guidance for CVE-2019-0830 and apply applicable updates.
- Prioritize internet-facing or broadly accessible SharePoint sites.
- Review compensating controls if patching is delayed.
- Monitor Microsoft advisory changes for version-specific guidance.
Validation and detection
- Inventory SharePoint Foundation 2013 SP1, Enterprise 2016, and Server 2019 systems.
- Compare patch status against Microsoft CVE-2019-0830 guidance.
- Review vulnerability scanner findings for this CVE.
- Confirm no unsupported exposed SharePoint instances remain.
- Document affected hosts, remediation status, and exceptions.
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-2019-0830 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-2019-0830CVE 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.