Security readout for executives and security teams
Plain-English summary
CVE-2020-1320 is a Microsoft SharePoint cross-site scripting issue. An authenticated attacker could send a crafted request that SharePoint fails to sanitize, potentially causing script execution in another user’s browser. The impact is limited confidentiality and integrity exposure, not service outage.
Executive priority
Treat this as a moderate-priority SharePoint hygiene item. It is not listed as known exploited in this bundle, but public or widely used SharePoint instances should be checked and updated because XSS can support account misuse and data exposure.
Technical view
The issue is CWE-79 XSS in affected SharePoint products. CVSS 3.1 is 5.4 with network access, low attack complexity, low privileges required, user interaction required, changed scope, and low confidentiality and integrity impact. Sources do not provide exploit details or product-specific fix steps in this bundle.
Likely exposure
Organizations running Microsoft SharePoint Enterprise Server 2016, SharePoint Server 2019 or 2010 SP2, or SharePoint Foundation 2013 SP1 may be exposed. Exposure is most relevant where authenticated users can reach the affected SharePoint server.
Exploitation context
The bundle marks this CVE as not in CISA KEV and provides no cited evidence of active exploitation. Exploitation requires a low-privileged authenticated attacker and user interaction, which lowers urgency compared with unauthenticated server-side vulnerabilities.
Researcher notes
Key constraints are PR:L and UI:R, so validation should focus on authenticated SharePoint attack surface and patch state. The source says this CVE is distinct from CVE-2020-1177, CVE-2020-1183, CVE-2020-1297, CVE-2020-1298, and CVE-2020-1318.
Mitigation direction
- Review Microsoft’s MSRC advisory for product-specific update guidance.
- Patch or retire affected SharePoint versions according to Microsoft guidance.
- Limit SharePoint access to trusted users and networks where practical.
- Prioritize remediation on internet-accessible or broadly accessible SharePoint deployments.
Validation and detection
- Inventory SharePoint deployments and map versions against the affected product list.
- Confirm MSRC-recommended updates are installed on affected servers.
- Check vulnerability scanner findings specifically for CVE-2020-1320.
- Review SharePoint exposure paths for authenticated external or partner access.
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-2020-1320 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-2020-1320CVE 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.