CVE-2026-85873 json
Skype for Business Elevation of Privilege Vulnerability
published 29d ago modified yesterday also EUVD-2026-100142
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 61%
- public exploits
- 0
- none known
Summary
Improper authorization in Skype for Business and Microsoft Lync allows an authorized attacker to elevate privileges over a network.
Patch / fix
- Microsoft Skype for Business Server 2015 CU13 6.0.9319.886
- Microsoft Skype for Business Server 2019 CU8 7.0.2046.583
- Microsoft Skype for Business Server Subscription Edition CU1 7.0.2046.889
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- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 29d ago
Exploit prediction
0.96% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C |
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected products
- Microsoft Skype for Business Server 2015 CU13
- Microsoft Skype for Business Server 2019 CU8
- Microsoft Skype for Business Server Subscription Edition CU1
Classification
- Weakness
-
- CWE-639 Authorization Bypass Through User-Controlled Key
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2026-85873
vendor-advisory, patch
Sources
- CVE List CVE-2026-85873
- NVD CVE-2026-85873
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