Remote Code Execution in Windows LSASS
CVE-2026-20854 is a Critical remote code execution vulnerability in the Windows Local Security Authority Subsystem Service (LSASS). The flaw is described as a use-after-free condition in LSASS, the Windows component responsible for authentication and handling sensitive credential material. According to the provided content, exploitation is possible over the network by an authorized attacker, including an authenticated attacker with low privileges, and does not require user interaction. Successful exploitation can result in code execution in the context of the affected LSASS component.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
LSASS use-after-free leading to local code execution in SYSTEM context (labeled RCE) per the content.
A network-reachable LSASS use-after-free that can allow authenticated remote code execution against a core Windows authentication component, with potentially high-impact outcomes (credential/security policy compromise).
A network-reachable LSASS use-after-free that can allow authenticated remote code execution against a core Windows authentication component, with potentially high-impact outcomes (credential/security policy compromise).
A remote code execution vulnerability affecting Windows LSASS, a core security subsystem.
The version that knows your environment.
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.