CVE-2023-29357 (GCVE-0-2023-29357)
Vulnerability from cvelistv5 – Published: 2023-06-13 23:26 – Updated: 2025-10-21 23:05Title
Microsoft SharePoint Server Elevation of Privilege Vulnerability
Summary
Microsoft SharePoint Server Elevation of Privilege Vulnerability
Severity
9.8 (Critical)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-04 18:37 UTC
CWE
- CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisory |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Microsoft | Microsoft SharePoint Server 2019 |
Affected:
16.0.0 , < 16.0.10399.20005
(custom)
cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:*:*:*:* |
Date Public
2023-06-13 07:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: e01ef2b6-3f00-4445-806c-094f8103aa12
Exploited: Yes
Timestamps
First Seen: 2024-01-10
Asserted: 2024-01-10
Scope
Notes: KEV entry: Microsoft SharePoint Server Privilege Escalation Vulnerability | Affected: Microsoft / SharePoint Server | Description: Microsoft SharePoint Server contains an unspecified vulnerability that allows an unauthenticated attacker, who has gained access to spoofed JWT authentication tokens, to use them for executing a network attack. This attack bypasses authentication, enabling the attacker to gain administrator privileges. | Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. | Due date: 2024-01-31 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-29357; https://nvd.nist.gov/vuln/detail/CVE-2023-29357
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-303 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | SharePoint Server |
| Due Date | 2024-01-31 |
| Date Added | 2024-01-10 |
| Vendorproject | Microsoft |
| Vulnerabilityname | Microsoft SharePoint Server Privilege Escalation Vulnerability |
| Knownransomwarecampaignuse | Known |
References
Created: 2026-02-02 13:24 UTC
| Updated: 2026-02-06 07:53 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 440e0e53-dd8e-4b26-8b77-ef0fa234a745
Exploited: Yes
Characteristics
Severity:
98.0
Timestamps
First Seen: 2023-10-18
Asserted: 2023-10-18
Last Seen: 2026-09-06
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Microsoft / SharePoint | Class: other-software | Severity: Critical (CVSS 9.8) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-09-06: 34
Evidence
Type: Honeypot
Signal: In The Wild Attempts
Confidence: 70%
Source: shadowserver
Details
| 1D | 3 |
|---|---|
| Iot | no |
| Feed | Shadowserver Foundation honeypot/exploited-vulnerabilities |
| Type | http-scan |
| Class | other-software |
| 7D Avg | 2 |
| Vendor | Microsoft |
| 30D Avg | 1 |
| 90D Avg | 1 |
| Product | SharePoint |
| Cisa Kev | yes |
| Connections | 34 |
| Observation Date | 2026-09-06 |
| Vulnerability Class | CVSS |
| Vulnerability Score | 9.8 |
| Vulnerability Severity | Critical |
References
Created: 2026-07-01 05:54 UTC
| Updated: 2026-09-08 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 771bf595-0a6f-4880-9398-f7eb6cfa2496
Exploited: Yes
Timestamps
First Seen: 2024-01-10
Asserted: 2024-01-10
Scope
Notes: KEVIntel entry: Microsoft SharePoint Server Elevation of Privilege Vulnerability | Affected: Microsoft / Microsoft SharePoint Server 2019 | CVSS: 9.8 (CRITICAL) | Used in malware: yes | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Confirmed Compromise
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | Microsoft SharePoint Server Elevation of Privilege Vulnerability |
| Vendor | Microsoft |
| Product | Microsoft SharePoint Server 2019 |
| Added Date | 2024-01-10T00:00:00.000Z |
| Cvss Score | 9.8 |
| Epss Score | None |
| Cvss Severity | CRITICAL |
| Epss Percentile | None |
| Used In Malware | yes |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 11:14 UTC
| Updated: 2026-06-23 11:14 UTC
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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