How severe is CVE-2023-41763?

CVE-2023-41763 has a CVSS score of 5.3/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2023-41763?

Affected package information for CVE-2023-41763 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2023-41763?

No fixed version has been published for CVE-2023-41763 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2023-41763 actively exploited in the wild?

Yes. There are 2 known exploit references for CVE-2023-41763, including 2 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2023-41763?

CVE-2023-41763 has an EPSS (Exploit Prediction Scoring System) score of 16.5%, placing it in the 95th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score warrants monitoring and prompt remediation.

Is CVE-2023-41763 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2023-41763 (Microsoft Skype for Business Privilege Escalation Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2023-10-10. CISA required all US federal civilian agencies to remediate this vulnerability by 2023-10-31. The required action was: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2023-41763?

CVE-2023-41763 is classified as Server-Side Request Forgery (SSRF) (CWE-918). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Which products and versions are affected by CVE-2023-41763?

CVE-2023-41763 affects microsoft skype for business server (2 versions, e.g. 2015, 2019). Check the affected-products list on this page against your deployed version to confirm exposure.

Is there exploit tooling available for CVE-2023-41763?

A Nuclei detection template exists for CVE-2023-41763, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2023-41763 published, and has it been updated?

CVE-2023-41763 was published on October 10, 2023 and was last updated on October 28, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2023-10-10 — agencies required to remediate by 2023-10-31

CVE-2023-41763

MEDIUM

Skype for Business Elevation of Privilege Vulnerability

Published

Oct 10, 2023

Updated

Oct 28, 2025

Affected

0 pkgs

Patched

None yet

Exploits

2 known

EPSS Exploitation Probability

via FIRST.org ↗

16.5%probability of exploitation in next 30 days

Moderate Risk95th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

Skype for Business Elevation of Privilege Vulnerability

Affected Products

1 product · 2 configurations

Application

skype for business servermicrosoft

2 versions

20152019

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Skype for Business Elevation of Privilege Vulnerability

portal.msrc.microsoft.comMSOct 2023

Skype for Business Elevation of Privilege Vulnerability

cisa.govCISAOct 2023

Frequently Asked Questions

Skype for Business Elevation of Privilege Vulnerability

O3 Security · Impact-Aware SCA

Is CVE-2023-41763 in your stack?

O3 detects CVE-2023-41763 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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