Security readout for executives and security teams
Plain-English summary
This is a SharePoint cross-site scripting flaw. An authenticated attacker could send a specially crafted request that causes script to run in another user's browser. Business risk is targeted account misuse or data exposure in SharePoint, but the published score is medium and there is no provided evidence of active exploitation.
Executive priority
Treat as a moderate priority. It is not presented as actively exploited, but SharePoint often stores sensitive internal content. Remediate during normal vulnerability management cycles, faster for externally reachable or business-critical farms.
Technical view
CVE-2019-1134 is CWE-79 in Microsoft SharePoint caused by improper sanitization of a specially crafted web request. CVSS 3.1 is 5.4, with network access, low complexity, low privileges required, user interaction required, changed scope, and low confidentiality and integrity impact.
Likely exposure
Organizations running Microsoft SharePoint Enterprise Server 2016, SharePoint Enterprise Server 2013 SP1, or SharePoint Server 2019 should assess exposure, especially internet-accessible or broadly used internal SharePoint deployments.
Exploitation context
The source bundle does not show CISA KEV listing or other cited evidence of active exploitation. The CVSS vector indicates exploitation requires low privileges and user interaction, so risk is more likely targeted than fully unauthenticated wormable compromise.
Researcher notes
Evidence is limited to the CVE description, affected product list, CVSS vector, and MSRC reference. Avoid assuming exploit availability, patch identifiers, or workarounds beyond Microsoft guidance unless the advisory is reviewed directly.
Mitigation direction
- Check the Microsoft MSRC advisory for official update and mitigation guidance.
- Prioritize remediation for internet-facing or high-value SharePoint farms.
- Limit SharePoint access to trusted users and networks where feasible.
- Review SharePoint customizations that may affect input handling or sanitization.
Validation and detection
- Inventory SharePoint Server and Enterprise Server versions across all farms.
- Confirm whether affected versions match 2013 SP1, 2016, or 2019.
- Verify applicable Microsoft guidance has been applied for each affected farm.
- Review SharePoint and IIS logs for unusual authenticated web requests.
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-2019-1134 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-2019-1134CVE 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.