What is CVE-2022-26910?

CVE-2022-26910 is a medium-severity vulnerability in Microsoft Skype For Business Server, classified under Authentication Bypass by Spoofing. CVSS score: 5.3/10. Published 2022-04-15.

How severe is CVE-2022-26910?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Microsoft Skype For Business Server

CVE-2022-26910

Skype for Business and Lync Spoofing Vulnerability

Published 2022-04-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.025 (84.3th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000

Affected products

Microsoft Skype For Business Server — versions 2015, 2019
Microsoft Skype For Business Server 2015 Cu12 — versions 9319.0
Microsoft Skype For Business Server 2019 Cu6 — versions 2046.0

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2022-26910 (vendor-advisory)

Frequently asked questions

What is CVE-2022-26910?: CVE-2022-26910 is a medium-severity vulnerability in Microsoft Skype For Business Server, classified under Authentication Bypass by Spoofing. CVSS score: 5.3/10. Published 2022-04-15.
How severe is CVE-2022-26910?: Medium severity. CVSS v3 base score is 5.3 out of 10.