CVE-2023-41763 (GCVE-0-2023-41763)
Vulnerability from cvelistv5 – Published: 2023-10-10 17:07 – Updated: 2025-10-21 23:05Title
Skype for Business Elevation of Privilege Vulnerability
Summary
Skype for Business Elevation of Privilege Vulnerability
Severity
SSVC
Exploitation: active
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-07-16 20:26 UTC
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
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
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Microsoft | Skype for Business Server 2015 CU13 |
Affected:
9319.0 , < 6.0.9319.869
(custom)
|
guessed | |
| Microsoft | Skype for Business Server 2019 CU7 |
Affected:
2046.0 , < 7.0.246.530
(custom)
|
guessed |
Date Public
2023-10-10 07:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: de69649c-6854-43a2-8738-5fabb8e829ea
Exploited: Yes
Timestamps
First Seen: 2023-10-10
Asserted: 2023-10-10
Scope
Notes: KEV entry: Microsoft Skype for Business Privilege Escalation Vulnerability | Affected: Microsoft / Skype for Business | Description: Microsoft Skype for Business contains an unspecified vulnerability that allows for privilege escalation. | Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. | Due date: 2023-10-31 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-41763; https://nvd.nist.gov/vuln/detail/CVE-2023-41763
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-918 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Skype for Business |
| Due Date | 2023-10-31 |
| Date Added | 2023-10-10 |
| Vendorproject | Microsoft |
| Vulnerabilityname | Microsoft Skype for Business Privilege Escalation Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-02-02 12:26 UTC
| Updated: 2026-02-06 07:17 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: e4a692b6-6753-4f4e-b20f-a12d05336b8f
Exploited: Yes
Timestamps
First Seen: 2023-10-10
Asserted: 2023-10-10
Scope
Notes: KEVIntel entry: Skype for Business Elevation of Privilege Vulnerability | Affected: Microsoft / Skype for Business Server 2015 CU13, Skype for Business Server 2019 CU7 | CVSS: 5.3 (MEDIUM) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | Skype for Business Elevation of Privilege Vulnerability |
| Vendor | Microsoft |
| Product | Skype for Business Server 2015 CU13, Skype for Business Server 2019 CU7 |
| Added Date | 2023-10-10T00:00:00.000Z |
| Cvss Score | 5.3 |
| Epss Score | None |
| Cvss Severity | MEDIUM |
| Epss Percentile | None |
| Used In Malware | unknown |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 14:05 UTC
| Updated: 2026-07-10 06:14 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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