CVE-2018-8238
A security feature bypass vulnerability exists when Skype for Business or Lync do not properly parse UNC path links shared via messages, aka "Skype for Business and Lync Security Feature Bypass Vulnerability." This affects Skype, Microsoft Lync.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (5.99%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A security feature bypass vulnerability exists when Skype for Business or Lync do not properly parse UNC path links shared via messages, aka "Skype for Business and Lync Security Feature Bypass Vulnerability." This affects Skype, Microsoft Lync.
- CVSS 3.0
- 7.8 HIGHCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 5.99% probability · 93th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- microsoft/lync · microsoft/skype for business
- Source
- secure@microsoft.com
EPSS 6.0% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/104619Third Party Advisory, VDB Entry
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8238Patch, Vendor Advisory
- http://www.securityfocus.com/bid/104619Third Party Advisory, VDB Entry
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8238Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.