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Skype for Business

CVE-2023-41763 — Skype for Business Elevation of Privilege Vulnerability

Important CVSS 5.3 EPSS 0.90353 ⚠️ Exploited in the wild 📢 Publicly disclosed 2023-10 archive

Executive Summary

None

Overview

5.3
CVSS MEDIUM
Important
MS Severity
Exploited
MS Exploit Status
Exploitation Detected
MS Exploit Likelihood
Category Elevation of Privilege
Released Oct 10 2023
Last Updated Oct 10 2023
Publicly Disclosed Yes
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.90353 — 0.99785 percentile
NVD CVSS 5.3 MEDIUM — matches MSRC

CVSS Vector

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
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
Low
INTEGRITY
None
AVAILABILITY
None
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 4.8

EPSS Score

0.90353
probability of exploitation in the next 30 days
0.99785 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

2 affected products
Product KB Article Severity Impact Restart Required
Skype for Business Server 2015 CU13 3061064 (Security Update) Important Elevation of Privilege Maybe
Skype for Business Server 2019 CU7 4470124 (Security Update) Important Elevation of Privilege Maybe

Patches

2 patches
Article Type Restart
3061064 Security Update Maybe
4470124 Security Update Maybe

Known Exploits

Acknowledgments

Anonymous, Dr. Florian Hauser (@frycos) with Code White GmbH

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