Security readout for executives and security teams
Plain-English summary
CVE-2020-1177 is a Microsoft SharePoint cross-site scripting issue. An authenticated attacker could send a specially crafted request that SharePoint fails to sanitize, potentially causing script execution in another user's browser. The business impact is limited but real: data exposure, session misuse, or unauthorized changes within affected SharePoint sites.
Executive priority
Treat this as a moderate-priority SharePoint hygiene item. It is not described as actively exploited or availability-impacting, but SharePoint often hosts sensitive internal data. Confirm affected versions and patch status through Microsoft guidance, especially for externally reachable or high-trust collaboration sites.
Technical view
This is CWE-79 XSS in Microsoft SharePoint caused by improper sanitization of a crafted web request. CVSS 3.1 is 5.4: network reachable, low complexity, low privileges required, user interaction required, changed scope, low confidentiality and integrity impact, no availability impact.
Likely exposure
Exposure is most likely in organizations running SharePoint Enterprise Server 2016, SharePoint Server 2019, or SharePoint Foundation 2013 SP1. Internet-facing or broadly accessible intranet SharePoint deployments have higher practical risk, especially where many low-privileged users can submit content or requests.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector indicates exploitation requires low privileges and user interaction, so this is not a unauthenticated server takeover issue. It is still relevant where SharePoint is trusted for internal collaboration.
Researcher notes
The strongest source details are CVE metadata and CVSS. The bundle identifies affected product families but does not include exact vulnerable build ranges, patch KBs, or exploit evidence. Avoid assuming remediation details beyond checking Microsoft’s advisory and validating deployed SharePoint versions.
Mitigation direction
- Check the Microsoft MSRC advisory for affected builds and vendor remediation guidance.
- Inventory SharePoint 2016, 2019, and Foundation 2013 SP1 deployments.
- Prioritize supported Microsoft security updates after confirming applicability.
- Limit access to affected SharePoint sites to trusted authenticated users where feasible.
- Review SharePoint hardening and monitoring around user-supplied content.
Validation and detection
- Confirm whether any listed SharePoint products exist in the environment.
- Compare installed SharePoint build levels against Microsoft MSRC guidance.
- Verify internet-facing and high-user-count SharePoint sites are prioritized.
- Use only approved benign XSS validation in test environments.
- Review logs for suspicious crafted requests to SharePoint endpoints.
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-2020-1177 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-2020-1177CVE 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.