5.3

CVE-2023-41763: Microsoft Skype for Business Privilege Escalation Vulnerability

CVSS: 5.3v3.1MediumKEVAnalyzed
Published 10-10-2023Last modified 21-10-2025
Open JSON

Vulnerability summary

CVE-2023-41763 is a medium (CVSS 5.3) Server-Side Request Forgery (SSRF) vulnerability in Microsoft Skype for Business. It is known to be exploited: CISA lists it, first on 10-10-2023. EPSS estimates a 90.55% chance of exploitation in the next 30 days, higher than 99.8% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
90.55%
0%100%
Critical · +0.19 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 10-10-2023
    PublishedVulnerability first disclosed.
  2. 10-10-2023
    Added to CISA KEVMicrosoft Skype for Business Privilege Escalation Vulnerability
  3. 31-10-2023
    CISA remediation dueApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  4. 21-10-2025
    Last modifiedVulnerability information updated.

Description

Skype for Business Elevation of Privilege Vulnerability

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

90.55%

Chance of exploitation in the next 30 days

Percentile

100%

Versus all other CVEs

30-day change

+0.19 pp

From 90.35% on 21-09-2026

21-09-202621-10-2026
EPSS score
90.55%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
10-10-2023
Federal due date
31-10-2023

CISA required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-41763 nvd.nist.gov/vuln/detail/CVE-2023-41763

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Microsoft3 products

1 vendor · 3 products

References

2 links