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A spoofing vulnerability in Microsoft Windows AppX/App Installer allows attackers to present a malicious application package as if it were a legitimate, trusted application. Observed abuse involved specially crafted App Installer packages delivered through phishing or links invoking the ms-appinstaller URI scheme. The vulnerable behavior allowed misleading publisher or trust information to be shown to the user, including cases where package branding and displayed publisher identity did not clearly align with the actual signing identity, enabling socially engineered installation of malware. Microsoft reported in-the-wild exploitation, including delivery chains associated with Emotet, TrickBot, and BazarLoader. The issue was addressed by Microsoft in the January 2022 Patch Tuesday release, and later Microsoft disabled the ms-appinstaller protocol by default to reduce abuse.
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What an attacker gets, and what they’ve been doing with it.
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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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft vulnerability that CISA KEV’s knownRansomwareCampaignUse field silently flipped to Known during 2025 (evidence of ransomware campaign use).
A Windows App Installer process vulnerability abused to deliver malware via ms-appinstaller links and malicious .appinstaller/.appxbundle packages, enabling deceptive installation of BazarBackdoor/BazarLoader payloads.
Unknown (the content only lists this CVE as a reference and does not describe the vulnerability, impact, affected products, or exploitation details).
A spoofing vulnerability in the Windows AppX Installer.
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.