6.5

CVE-2026-85873: microsoft skype for business server 2015 cu13

CVSS: 6.5v3.1MediumUndergoing analysis
Published 13-10-2026Last modified 20-10-2026
Open JSON

Vulnerability summary

CVE-2026-85873 is a medium (CVSS 6.5) vulnerability in microsoft skype for business server 2015 cu13. EPSS estimates a 0.82% chance of exploitation in the next 30 days, higher than 56.6% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.82%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 13-10-2026
    PublishedVulnerability first disclosed.
  2. 20-10-2026
    Last modifiedVulnerability information updated.

Description

Improper authorization in Skype for Business and Microsoft Lync allows an authorized attacker to elevate privileges over a network.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.82%

Chance of exploitation in the next 30 days

Percentile

57%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

14-10-202620-10-2026
EPSS score
0.82%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Microsoft3 products

1 vendor · 3 products

References

1 links