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CVE-2023-21434 is an improper input validation vulnerability in Samsung Galaxy Store prior to version 4.5.49.8. The flaw affects a WebView/deep-link handling path associated with com.sec.android.app.samsungapps.deeplink.CloudGameDeepLink. According to the provided content, the vulnerable logic accepts a monitoringHost value if it merely contains the trusted string "player.glb.samsung-gamelauncher.com" rather than enforcing strict host validation. This allows an attacker to supply an attacker-controlled domain such as "player.glb.samsung-gamelauncher.com.nccgroup.com" to bypass the domain filter and cause malicious web content to be loaded in the Galaxy Store WebView, resulting in JavaScript execution.
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No public exploit code observed for this vulnerability.
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2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Unknown (only referenced as related content; described generally as Samsung Galaxy Store app vulnerabilities).
An improper input validation vulnerability in a Galaxy App Store WebView URL filter that allows attackers to bypass domain restrictions and load attacker-controlled content, enabling JavaScript execution in the WebView.
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.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.