SSRF in Microsoft Skype For Business Server
CVE-2026-66304
Server-side request forgery (ssrf) in Skype for Business allows an unauthorized attacker to disclose information over a network.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.010 (61.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 62nd percentile — 61.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- Microsoft Skype For Business Server — versions 2015, 2019
- Microsoft Skype For Business Server 2015 Cu13
- Microsoft Skype For Business Server Subscription Edition — versions 7.0.2046.849
Weakness classification (CWE)
References
- Skype for Business Information Disclosure Vulnerability (vendor-advisory, Patch, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-66304?
- CVE-2026-66304 is a high-severity vulnerability in Microsoft Skype For Business Server, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.5/10. Published 2026-09-08.
- How severe is CVE-2026-66304?
- High severity. CVSS v3 base score is 7.5 out of 10.