Skype for Business Spoofing Vulnerability
Priority LOW 30CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Microsoft. Impact type from Microsoft.
Summary
Improper neutralization of input during web page generation ('cross-site scripting') in Skype for Business allows an unauthorized attacker to perform spoofing over a network.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00553 46th percentileScored 2026-11-07
Fix Fixed Microsoft: 3 updates
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Microsoft | Skype for Business Server 2015 CU13 | 9319.0 to before 6.0.9319.885 | 6.0.9319.885 | Patch available | CNA |
| Microsoft | Skype for Business Server 2019 CU8 | 2046.0 to before 7.0.2046.569 | 7.0.2046.569 | Patch available | CNA |
| Microsoft | Skype for Business Server Subscription Edition CU1 | 2046.0 to before 7.0.2046.879 | 7.0.2046.879 | Patch available | CNA |
- Skype for Business Server 2015 CU13 VendorMicrosoft Affected 9319.0 to before 6.0.9319.885 Fixed in 6.0.9319.885 Patch available CNA
- Skype for Business Server 2019 CU8 VendorMicrosoft Affected 2046.0 to before 7.0.2046.569 Fixed in 7.0.2046.569 Patch available CNA
- Skype for Business Server Subscription Edition CU1 VendorMicrosoft Affected 2046.0 to before 7.0.2046.879 Fixed in 7.0.2046.879 Patch available CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_13:*:*:*:*:*:* | 2015 cumulative_update_13 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_13_hotfix_2:*:*:*:*:*:* | 2015 cumulative_update_13_hotfix_2 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_8:*:*:*:*:*:* | 2019 cumulative_update_8 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_8_hotfix1:*:*:*:*:*:* | 2019 cumulative_update_8_hotfix1 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_8_hotfix2:*:*:*:*:*:* | 2019 cumulative_update_8_hotfix2 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:skype_for_business_server_subscription_edition:7.0.2046.849:*:*:*:*:*:*:* | 7.0.2046.849 | Vulnerable | Microsoft |
- cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_13:*:*:*:*:*:* Versions 2015 cumulative_update_13 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_13_hotfix_2:*:*:*:*:*:* Versions 2015 cumulative_update_13_hotfix_2 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_8:*:*:*:*:*:* Versions 2019 cumulative_update_8 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_8_hotfix1:*:*:*:*:*:* Versions 2019 cumulative_update_8_hotfix1 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_8_hotfix2:*:*:*:*:*:* Versions 2019 cumulative_update_8_hotfix2 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:skype_for_business_server_subscription_edition:7.0.2046.849:*:*:*:*:*:*:* Versions 7.0.2046.849 Vulnerable ·Microsoft
Remediation
Vendor assessments
Microsoft
Microsoft's page for this CVE →
- Impact
- Spoofing
- Exploited
- No
- Publicly disclosed
- No
- Exploitability
- Exploitation Less Likely
Timeline
- 2026-10-02 Threatist record created from CVE-2026-63523
- 2026-10-03 Alias added: GHSA-cgvg-jx73-642p
References
More Microsoft Skype For Business Server vulnerabilities
- TI-2023-22168 Skype for Business Elevation of Privilege Vulnerability KEVCVSS 3.1MEDIUM 5.3
- TI-2026-47101 Skype for Business Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
- TI-2026-47106 Skype for Business and Lync Denial of Service Vulnerability CVSS 3.1HIGH 7.5
- TI-2026-47103 Skype for Business Information Disclosure Vulnerability CVSS 3.1HIGH 7.5
- TI-2023-18582 Skype for Business Remote Code Execution Vulnerability CVSS 3.1HIGH 7.2
- TI-2026-48945 Skype for Business Spoofing Vulnerability CVSS 3.1HIGH 8.3
Sources
- CVE-2026-63523 · CVE Program
- CVE-2026-63523 · NVD
- FIRST EPSS
- GHSA-cgvg-jx73-642p · GitHub Advisory Database · CC BY 4.0
- CVE-2026-63523 · Microsoft Security Update Guide
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences