Security readout for executives and security teams
Plain-English summary
CVE-2023-29357 is a critical SharePoint Server elevation-of-privilege issue. A network attacker needs no credentials or user interaction, and the CVSS impact rates confidentiality, integrity, and availability as high. CISA lists it in KEV, so exposed or unpatched SharePoint should be treated as urgent.
Executive priority
Treat this as a top-priority remediation item. It affects a business-critical collaboration platform, requires no attacker credentials, has maximum CVSS impact, and is listed by CISA as known exploited.
Technical view
The provided CVSS vector is 9.8: AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H with CWE-303. The bundle identifies Microsoft SharePoint Server 2019 version 16.0.0 as affected and shows official remediation availability. Public details provided here do not include root-cause mechanics or safe validation indicators.
Likely exposure
Organizations running Microsoft SharePoint Server 2019 version 16.0.0 are the identified exposure group. Internet-facing SharePoint deployments carry the highest business risk because exploitation is network-reachable and unauthenticated per the CVSS vector.
Exploitation context
Active exploitation is supported by the CISA KEV listing. The supplied sources do not describe observed campaigns, exploit chains, target sectors, or exploitation volume, so those details should not be assumed.
Researcher notes
Useful public evidence is limited to vendor, CVE, and KEV data in this bundle. Do not infer exploit mechanics from the CWE alone. Focus validation on asset identification, patch state, exposure, and telemetry review.
Mitigation direction
- Apply Microsoft’s official security update guidance for CVE-2023-29357.
- Prioritize internet-facing SharePoint Server 2019 systems for remediation.
- Restrict external access to vulnerable SharePoint until patched.
- Monitor SharePoint authentication, privilege, and administrative activity for anomalies.
- Track the CISA KEV entry as a prioritization signal.
Validation and detection
- Inventory SharePoint Server instances and versions, especially 2019 version 16.0.0.
- Confirm installed patch level against Microsoft’s CVE-2023-29357 advisory.
- Identify whether affected SharePoint servers are internet-facing.
- Review logs for unusual authentication or privilege-related activity.
- Document remediation status for vulnerable assets.
Public sources used
Michael Williams reviewed this cited source version on .
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-303: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2023-29357 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/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.
CISA KEV status
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:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- Microsoft SharePoint Server Elevation of Privilege VulnerabilityCVE reference · vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-29357CVE reference · government-resource
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.
Incorrect Implementation of Authentication Algorithm
Incorrect Implementation of Authentication Algorithm represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.