JavaScript execution via misconfigured WebView domain filter
Published Feb 9, 2023 · Updated Mar 20, 2025
Improper input validation in Samsung Galaxy Store before 4.5.49.8 allows local attackers to execute JavaScript through a launched web page. CloudGameDeepLink.e() accepts monitoringHost values that merely contain an approved hostname, so attacker-controlled subdomains pass the WebView domain filter. On affected Samsung devices, exploitation requires a Chrome link tap or a preinstalled rogue app and runs script from an attacker-controlled HTTPS site.
Summary
What happened
Improper input validation in Samsung Galaxy Store before 4.5.49.8 allows local attackers to execute JavaScript through a launched web page. CloudGameDeepLink.e() accepts monitoringHost values that merely contain an approved hostname, so attacker-controlled subdomains pass the WebView domain filter. On affected Samsung devices, exploitation requires a Chrome link tap or a preinstalled rogue app and runs script from an attacker-controlled HTTPS site.
The record
- CVE
- CVE-2023-21434
- Published
- Feb 9, 2023
- Updated
- Mar 20, 2025
- Vendor
- Samsung Electronics Co., Ltd.
- Product
- Samsung Galaxy Store
- Classifications
- CWE-79, CWE-20, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 9, 2023CVE publishedPublication date reported by the CVE source.
- Mar 20, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <4.5.49.8
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- NCC Group malicious-link proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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