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CVE-2026-34337 is a local elevation-of-privilege vulnerability in the Windows Cloud Files Mini Filter Driver, a kernel-mode file system mini-filter used to support cloud synchronization features such as Files On-Demand. The flaw is caused by a use-after-free condition and is also associated with a race condition. An authenticated local attacker with low privileges can trigger the vulnerable condition in the driver and exploit it to execute in a more privileged kernel context. Because the affected component operates in kernel mode, successful exploitation can result in escalation from a low-privileged user context to SYSTEM.
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What an attacker gets, and what they’ve been doing with it.
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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.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A local elevation of privilege vulnerability in the Windows Cloud Files Mini Filter Driver caused by a use-after-free condition, with race condition weakness also noted. Successful exploitation could allow an authorized attacker to gain SYSTEM privileges.
A local elevation of privilege vulnerability in the Windows Cloud Files Mini Filter Driver (cldflt.sys) caused by a use-after-free and race condition, allowing a low-privilege local user to gain SYSTEM-level access.
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.