Security readout for executives and security teams
Plain-English summary
CVE-2020-1523 is a Microsoft SharePoint Server 2019 flaw that could let an authenticated user alter another user's profile data. This is not a remote unauthenticated takeover, but it matters where SharePoint profile data supports identity, collaboration, trust, or workflow decisions.
Executive priority
Treat as a high-priority SharePoint patching and access-control issue, especially for externally reachable or broad-user environments. The business risk is unauthorized profile tampering that can undermine identity trust and collaboration workflows.
Technical view
Microsoft describes a tampering vulnerability caused by improper handling of profile data in SharePoint Server 2019. Successful exploitation requires authentication and a modified request targeting a specific user. The CVSS 3.1 score is 8.9, with network access, low complexity, low privileges, user interaction, changed scope, and high confidentiality and integrity impact.
Likely exposure
Exposure is limited to environments running Microsoft SharePoint Server 2019 version 16.0.0 as listed in the source bundle. Risk is higher where many authenticated users, partners, or lower-trust accounts can access SharePoint.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Exploitation is described as authenticated and targeted against a specific user's profile data; public technical detail in the provided sources is limited.
Researcher notes
No CWE is supplied in the bundle, and the sources do not provide exploit mechanics. The CVSS vector includes user interaction, but the bundle does not explain that requirement. Do not assume impact beyond SharePoint Server 2019 unless confirmed by MSRC.
Mitigation direction
- Apply the Microsoft security update for CVE-2020-1523.
- Check MSRC guidance for exact affected builds and update packages.
- Restrict SharePoint access to trusted authenticated users only.
- Review account permissions and remove unnecessary SharePoint access.
- Monitor profile data changes for unexpected modifications.
Validation and detection
- Inventory SharePoint Server 2019 instances and versions.
- Confirm installed security updates match Microsoft guidance.
- Review SharePoint user profile audit logs for suspicious changes.
- Validate that low-trust users cannot modify other users' profiles.
- Check exposed SharePoint portals for unnecessary external 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
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CVE-2020-1523 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L/E:P/RL:O/RC:C
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:H/I:H/A:L/E:P/RL:O/RC:C2.36Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.9HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L/E:P/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1523CVE 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.