CVE-2026-69646

Skype for Business Spoofing Vulnerability

CVE-2026-69646 is fixed in 3 products on 1 platform, first by KB5123301, released September 8, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

8.3

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0032

25th percentile

<p>Improper verification of cryptographic signature in Skype for Business allows an unauthorized attacker to perform spoofing over an adjacent network.</p>

Where it's fixed

Product	Fix	Released
Microsoft
Skype for Business Server 2015 CU13	KB5123301	Sep 8, 2026
Skype for Business Server 2019 CU8	KB5123300	Sep 8, 2026
Skype for Business Server Subscription Edition CU1	KB5123287	Sep 8, 2026

Details

Published
September 8, 2026
Weakness
Improper Verification of Cryptographic Signature
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69646

For tools and AI agents

This page as data: JSON · Markdown

Link to this page

If this page saved you time, a link to it in your ticket, advisory or write-up helps others find it.

HTML

<a href="https://patchblox.com/security/cve/CVE-2026-69646">CVE-2026-69646 on Patchblox Patch Radar</a>

Reusing the data? How to credit Patch Radar.

Is this on your machines?

Patchblox finds every install below the fixed version on Windows, macOS and Linux, and updates them through your release rings.

Get a demo

Patch Radar data is free to use with attribution. Terms and how to credit it.

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.