CVE-2026-66304: CWE-918: Server-Side Request Forgery (SSRF) in Microsoft Skype for Business Server 2015 CU13
Description
Server-side request forgery (ssrf) in Skype for Business allows an unauthorized attacker to disclose information over a network.
CVSS v3.1
Score 7.5high
Affected software
Microsoft
Skype for Business Server 2015 CU13
Microsoft
Skype for Business Server 2019 CU8
Microsoft
Skype for Business Server Subscription Edition CU1
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, tracked as CVE-2026-66304 and categorized under CWE-918, affects Microsoft Skype for Business Server 2015 CU13. It enables an attacker to perform server-side request forgery, which can lead to unauthorized information disclosure over the network. The CVSS v3.1 base score is 7.5, reflecting high severity with network attack vector, low attack complexity, no privileges or user interaction required, and high impact on confidentiality. Microsoft has released an official fix for this vulnerability.
Potential Impact
An attacker can exploit this SSRF vulnerability to cause the affected Skype for Business Server to disclose sensitive information over the network. The impact is limited to confidentiality loss; integrity and availability are not affected. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66304 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-24T18:06:51.294Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66304","vendor":"Microsoft"}]
Threat ID: 6aa059e1acd9273b4913b7fe
Added to database: 09/08/2026, 18:54:25 UTC
Last enriched: 10/14/2026, 21:29:24 UTC
Last updated: 10/23/2026, 01:15:25 UTC
Views: 90
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