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CVE-2026-66302 is an external control of file name or path vulnerability in Skype for Business Server. An unauthenticated network attacker can send a specially crafted request that causes the server to write an arbitrary file, enabling remote code execution. Affected releases include Skype for Business Server 2015 CU13, Skype for Business Server 2019 CU8, and Skype for Business Server Subscription Edition CU1.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical, network-accessible code-execution vulnerability in Microsoft Skype for Business caused by external control of a file name or path.
A critical unauthenticated remote-code-execution vulnerability in Skype for Business Server. An attacker can use a specially crafted network request to control a file name or path and write an arbitrary file to the server.
A Skype for Business vulnerability involving external control of a file name or path that permits an unauthorized network attacker to execute code.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.