Quick answers
- Is CVE-2026-66308 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-66308 being exploited in the wild.
- How severe is CVE-2026-66308?
- Medium severity, with a CVSS score of 6.5, published 8 September 2026.
- Which products and versions are affected?
- Microsoft Skype for Business.
- Is there a fix for CVE-2026-66308?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-66308 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-66308?
- 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.
Technical details
An out-of-bounds read vulnerability exists in Microsoft Skype for Business, allowing an authenticated attacker to trigger a denial of service condition. The vulnerability requires network access and valid authentication credentials. By sending a specially crafted network message, an attacker can cause the application to read memory outside of allocated bounds, leading to application crash or service interruption. A patch is available from Microsoft.
Affected products
- Microsoft Skype for Business
Timeline
- 2026-09-08: disclosed: CVE-2026-66308 published