CVE-2023-41763 (GCVE-0-2023-41763)

Vulnerability from cvelistv5 – Published: 2023-10-10 17:07 – Updated: 2025-10-21 23:05
VLAI CISA Shadowserver Previdian
Title
Skype for Business Elevation of Privilege Vulnerability
Summary
Skype for Business Elevation of Privilege Vulnerability
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C
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
microsoft CNA under the mitre root
CNA scorecard B 82/100 over 4926 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Microsoft Skype for Business Server 2015 CU13 Affected: 9319.0 , < 6.0.9319.869 (custom)
guessed Create a notification for this product.
Microsoft Skype for Business Server 2019 CU7 Affected: 2046.0 , < 7.0.246.530 (custom)
guessed Create a notification for this product.
Date Public
2023-10-10 07:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: de69649c-6854-43a2-8738-5fabb8e829ea

Vulnerability ID: CVE-2023-41763

Status: Confirmed

Status Updated: 2023-10-10 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2023-10-10
Asserted: 2023-10-10
Scope
Notes: 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: 2026-11-04 13:36 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 2ce915a4-4043-43b1-88ae-d74a931199fe

Vulnerability ID: CVE-2023-41763

Status: Confirmed

Status Updated: 2026-11-04 00:00 UTC

Exploited: Yes

Characteristics
Severity: 53.0
Timestamps
First Seen: 2026-09-21
Asserted: 2026-09-21
Last Seen: 2026-11-04
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Microsoft / Skype | Class: other-software | Severity: Medium (CVSS 5.3) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-11-04: 2
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class other-software
7D Avg 0
Vendor Microsoft
30D Avg 0
90D Avg 0
Product Skype
Cisa Kev yes
Connections 2
Observation Date 2026-11-04
Vulnerability Class CVSS
Vulnerability Score 5.3
Vulnerability Severity Medium
References
Created: 2026-10-21 09:02 UTC | Updated: 2026-11-06 01:03 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: e4a692b6-6753-4f4e-b20f-a12d05336b8f

Vulnerability ID: CVE-2023-41763

Status: Confirmed

Status Updated: 2023-10-10 00:00 UTC

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
Show details on NVD website
To clipboard 

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                  "version": "2046.0",
                  "versionType": "custom"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:a:microsoft:skype_for_business_server:*:cu13:*:*:*:*:*:*",
                      "versionEndExcluding": "6.0.9319.869",
                      "versionStartIncluding": "9319.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:a:microsoft:skype_for_business_server:*:cu7:*:*:*:*:*:*",
                      "versionEndExcluding": "7.0.246.530",
                      "versionStartIncluding": "2046.0",
                      "vulnerable": true
                    }
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                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "datePublic": "2023-10-10T07:00:00.000Z",
          "descriptions": [
            {
              "lang": "en-US",
              "value": "Skype for Business Elevation of Privilege Vulnerability"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 5.3,
                "baseSeverity": "MEDIUM",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C",
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              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en-US",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-918",
                  "description": "CWE-918: Server-Side Request Forgery (SSRF)",
                  "lang": "en-US",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-04-14T22:45:50.701Z",
            "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
            "shortName": "microsoft"
          },
          "references": [
            {
              "name": "Skype for Business Elevation of Privilege Vulnerability",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-41763"
            }
          ],
          "title": "Skype for Business Elevation of Privilege Vulnerability"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
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        "cveId": "CVE-2023-41763",
        "datePublished": "2023-10-10T17:07:24.950Z",
        "dateReserved": "2023-08-31T23:08:32.064Z",
        "dateUpdated": "2025-10-21T23:05:34.874Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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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.