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CVE-2026-33835 is a local elevation-of-privilege vulnerability in the Windows Cloud Files Mini Filter Driver, implemented in the kernel-mode component cldflt.sys. The flaw is a use-after-free condition in which a memory object can be freed while a stale reference remains reachable, enabling subsequent access to invalid memory. Available reporting indicates exploitation may involve crafted I/O request patterns or IOCTL-driven interaction with the driver to trigger the vulnerable code path and reclaim the freed memory with attacker-controlled data. Because the affected component executes in kernel mode and underpins Windows cloud file synchronization functionality, successful exploitation can allow a low-privileged local user to transition from user mode to SYSTEM-level control without user interaction.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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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.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An important Windows Cloud Files Mini Filter Driver elevation of privilege vulnerability that Microsoft determined is more likely to be exploited.
A local elevation of privilege vulnerability in the Windows Cloud Files Mini Filter Driver caused by a use-after-free condition, allowing an authorized attacker to gain SYSTEM privileges.
A local privilege escalation vulnerability caused by a use-after-free condition in the Windows Cloud Files Mini Filter Driver (cldflt.sys) that can allow a low-privileged local user to gain SYSTEM privileges.
Another elevation of privilege vulnerability in the Windows Cloud Files Mini Filter Driver mentioned as part of the same May 2026 patch cluster.
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.