CVE-2023-41763 Microsoft Skype for Business: web page flaw
In plain words: A web app can be made to act on someone's behalf or reach places it should not. Stolen sessions, actions taken as the victim, or access to internal systems.
Confirmed exploited by CISA on · US federal patch deadline Oct 31, 2023
What to do
- Install Microsoft's security update for Skype for Business. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- Microsoft Skype for Business Privilege Escalation Vulnerability
- Product
- Microsoft Skype for Business
- CISA description
- Microsoft Skype for Business contains an unspecified vulnerability that allows for privilege escalation.
- Type of flaw
- Web page flaw (CWE-918)
- Confirmed exploited
- Oct 10, 2023
- US federal patch deadline
- Oct 31, 2023
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Answering about CVE-2023-41763 ·
Questions about CVE-2023-41763
Is CVE-2023-41763 being exploited?
Yes. CISA added CVE-2023-41763 to its Known Exploited Vulnerabilities catalog on Oct 10, 2023, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2023-41763?
Install Microsoft's security update for Skype for Business. If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2023-41763?
Only if you use Microsoft Skype for Business. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.