Security readout for executives and security teams
CVE-2019-0557 is a Microsoft SharePoint cross-site scripting issue. An attacker with some access could send a crafted web request that SharePoint fails to sanitize properly. Business impact is mainly unauthorized actions or data exposure in a user’s browser context, not system takeover or service outage. Exposure is limited to environments running affected Microsoft SharePoint, specifically SharePoint Enterprise Server 2016 per the provided data. Internet-facing or widely accessible SharePoint portals increase practical concern, but the source bundle does not provide deployment-specific exposure details. Treat as a moderate-priority SharePoint security update item. It is not evidenced as actively exploited here, but SharePoint often hosts sensitive collaboration data, so exposed affected servers should be verified and remediated through Microsoft guidance. Mitigation focus: Review Microsoft’s MSRC advisory for CVE-2019-0557 and affected SharePoint builds.; Apply vendor-provided SharePoint security updates if MSRC lists your build as affected.; Prioritize internet-facing or heavily used SharePoint Enterprise Server 2016 instances..
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
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ATT&CK lookup starting points
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CWE-79: User-session and phishing behavior lookup
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Open ATT&CK lookupCVE-2019-0557 mapping review
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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
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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-2019-0557CVE reference · x_refsource_CONFIRM
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.