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Medium 6.5Published Sep 8, 2026
CVE-2026-66303Skype for Business and Lync Denial of Service Vulnerability
Updated under an hour ago ()
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It affects Microsoft Skype for Business Server 2015 CU13 and 4 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Null pointer dereference in Skype for Business allows an authorized attacker to deny service over a network.
- CVSS
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
- Weakness (CWE)
- CWE-476
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- microsoft
- NVD analysis
- Analyzed
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Microsoft Skype for Business Server 2015 CU13 microsoft:skype_for_business_server_2015_cu13 (from the name) | 9319.0 builds before 6.0.9319.885 | CNA record |
Microsoft Skype for Business Server 2019 CU8 microsoft:skype_for_business_server_2019_cu8 (from the name) | 2046.0 builds before 7.0.2046.569 | CNA record |
Microsoft Skype for Business Server Subscription Edition CU1 microsoft:skype_for_business_server_subscription_edition_cu1 (from the name) | 2046.0 builds before 7.0.2046.879 | CNA record |
microsoft skype_for_business_server microsoft:skype_for_business_server | 2015; 2015; 2019; 2019; 2019 | NVD |
microsoft skype_for_business_server_subscription_edition microsoft:skype_for_business_server_subscription_edition | 7.0.2046.849 | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66303vendor-advisory, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.