CVE-2026-83746ImportantEoPNetwork
Skype for Business Elevation of Privilege Vulnerability
Assessment
Absolute path traversal in Skype for Business and Microsoft Lync allows an authorized attacker to elevate privileges over a network.
- Severity
- Important
- CVSS base score
- 8.1CVSS:3.1/
AV:N/ AC:L/ PR:L/ UI:N/ S:U/ C:N/ I:H/ A:H/ E:U/ RL:O/ RC:C - Impact
- Elevation of Privilege
- EPSS, next 30 days
- Not scored yet
- Public exploit code
- No Nuclei template lists it
- Exploitability
- Exploitation Less Likely
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- Skype for Business and Microsoft Lync
- Weakness
- CWE-36: Absolute Path Traversal
- Issued by
- Microsoft
- Published
- 13 Oct 2026 · October 2026
- Last revised
- 13 Oct 2026
CVSS 3.1 base metricsRed raises the risk · green lowers it
- Attack vector
- NetworkAV:N
- Attack complexity
- LowAC:L
- Privileges required
- LowPR:L
- User interaction
- NoneUI:N
- Scope
- UnchangedS:U
- Confidentiality
- NoneC:N
- Integrity
- HighI:H
- Availability
- HighA:H
Updates that fix it
3 KBs| KB | Type | Applies to | Other CVEs |
|---|---|---|---|
| KB5131692 | Security Update | Skype for Business Server Subscription Edition CU1 | All CVEs in KB5131692 |
| KB5131693 | Security Update | Skype for Business Server 2019 CU8 | All CVEs in KB5131693 |
| KB5132779 | Security Update | Skype for Business Server 2015 CU13 | All CVEs in KB5132779 |
What changed
First observed 14 Oct 2026No field changes in the recorded history.
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