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

Source: https://junglewise.ai/threats/cve-2023-41763-microsoft-skype-for-business-privilege-escalation-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2023-10-10. Updated: 2026-05-09  
License: CC BY 4.0 with a link back

CVE-2023-41763 · Severity: critical · CVSS 5.3 · Exploited in the wild · Published 2023-10-10

Microsoft Skype for Business Server contains a privilege escalation vulnerability caused by improper handling of server-side requests (SSRF). An unauthenticated attacker can send a specially crafted network request to gain access to sensitive information, such as IP addresses or port numbers, which could lead to further elevation of privilege.

Technologies: [Microsoft Skype for Business](https://junglewise.ai/threats/technologies/skype-for-business). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2023-41763 exploited in the wild?** Yes. CVE-2023-41763 is known to be exploited in the wild, first recorded on 10 October 2023. Treat it as urgent.

**How severe is CVE-2023-41763?** Critical severity, with a CVSS score of 5.3, published 10 October 2023.

**Which products and versions are affected?** Microsoft Skype for Business Server 2015 Cumulative Update 13; Microsoft Skype for Business Server 2019 Cumulative Update 7.

**Is there a fix for CVE-2023-41763?** A patch was published on 2023-10-10. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2023-41763 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2023-41763?** Check whether you run Microsoft Skype for Business. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Microsoft Skype for Business Server 2015 Cumulative Update 13
- Microsoft Skype for Business Server 2019 Cumulative Update 7

## Timeline

- 2023-10-10: disclosed
- 2023-10-10: advisory
- 2023-10-10: patched
- 2023-10-10: kev added: Added to CISA Known Exploited Vulnerabilities (KEV) catalog.
- 2023-10-10: exploited: Reported as exploited in the wild at the time of publication.

## Related threats

- [Microsoft Skype for Business and Lync privilege escalation](https://junglewise.ai/threats/cve-2026-85873-improper-authorization-in-skype-for-business-and-microsoft-lync)
- [Microsoft Skype for Business cryptographic signature spoofing](https://junglewise.ai/threats/cve-2026-69646-microsoft-skype-for-business-cryptographic-signature-spoofing)
- [Microsoft Skype for Business cross-site scripting in web page generation](https://junglewise.ai/threats/cve-2026-69642-microsoft-skype-for-business-cross-site-scripting-in-web-page)
- [Microsoft Skype for Business out-of-bounds read](https://junglewise.ai/threats/cve-2026-66308-microsoft-skype-for-business-out-of-bounds-read)
- [Microsoft Skype for Business integer underflow denial of service](https://junglewise.ai/threats/cve-2026-66307-microsoft-skype-for-business-integer-underflow-denial-of-service)