CVE-2026-66304 Skype for Business - Server Side Request Forgery

Skype for Business contains a server-side request forgery caused by improper validation of URLs, letting unauthorized attackers disclose information over a network, exploit requires network access.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.97% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Server Side Request Forgery
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
8 September 2026
Updated
15 October 2026
Weakness
CWE-918

Vendor fix

Update to the latest version of Skype for Business.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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