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Vulnerability record · CVE-2024-5739 · published 12 June 2024

CVE-2024-5739: Linecorp line cross-site scripting vulnerability

Linecorp · Line

The in-app browser of LINE client for iOS versions below 14.9.0 contains a Universal XSS (UXSS) vulnerability. This vulnerability allows for cross-site scripting (XSS) where arbitrary JavaScript can be executed in the top frame from an embedded iframe on any displayed web site within the in-app browser. The in-app browser is usually opened by tapping on URLs contained in chat messages, and for the attack to be successful, the victim must trigger a click event on a malicious iframe. If an iframe embedded in any website can be controlled by an attacker, this vulnerability could be exploited to capture or alter content displayed in the top frame, as well as user session information. This vulnerability affects LINE client for iOS versions below 14.9.0 and does not affect other LINE clients such as LINE client for Android. Please update LINE client for iOS to version 14.9.0 or higher.

6.1 CVSS 3.1 Medium EPSS 0.27% · top 82.7% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score
0.27%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

The in-app browser of LINE client for iOS versions below 14.9.0 contains a Universal XSS (UXSS) vulnerability. This vulnerability allows for cross-site scripting (XSS) where arbitrary JavaScript can be executed in the top frame from an embedded iframe on any displayed web site within the in-app browser. The in-app browser is usually opened by tapping on URLs contained in chat messages, and for the attack to be successful, the victim must trigger a click event on a malicious iframe. If an iframe embedded in any website can be controlled by an attacker, this vulnerability could be exploited to capture or alter content displayed in the top frame, as well as user session information. This vulnerability affects LINE client for iOS versions below 14.9.0 and does not affect other LINE clients such as LINE client for Android. Please update LINE client for iOS to version 14.9.0 or higher.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://hackerone.com/reports/2284129 Permissions RequiredThird Party Advisory
https://hackerone.com/reports/2284129 Permissions RequiredThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-5554Linecorp line improper certificate validation vulnerabilityLack of TLS certificate verification in log transmission of a financial module within LINE client for iOS prior to 13.16.0.EPSS 0.22%8.2CVE-2023-45559Linecorp line vulnerabilityAn issue in Tamaki_hamanoki Line v.13.6.1 allows attackers to send crafted notifications via leakage of the channel access token.EPSS 0.49%8.2CVE-2023-43305Linecorp line vulnerabilityAn issue in studio kent mini-app on Line v13.6.1 allows attackers to send crafted malicious notifications via leakage of the channel access token.EPSS 0.57%8.2CVE-2023-43303Linecorp line vulnerabilityAn issue in craftbeer bar canvas mini-app on Line v13.6.1 allows attackers to send crafted malicious notifications via leakage of the channel access …EPSS 0.53%8.2CVE-2023-43304Linecorp line authentication bypass by spoofing vulnerabilityAn issue in PARK DANDAN mini-app on Line v13.6.1 allows attackers to send crafted malicious notifications via leakage of the channel access token.EPSS 0.55%8.2CVE-2023-43300Linecorp line vulnerabilityAn issue in urban_project mini-app on Line v13.6.1 allows attackers to send crafted malicious notifications via leakage of the channel access token.EPSS 0.53%8.2CVE-2023-43301Linecorp line code injection vulnerabilityAn issue in DARTS SHOP MAXIM mini-app on Line v13.6.1 allows attackers to send crafted malicious notifications via leakage of the channel access toke…EPSS 0.58%8.2CVE-2023-43302Linecorp line vulnerabilityAn issue in sanTas mini-app on Line v13.6.1 allows attackers to send crafted malicious notifications via leakage of the channel access token.EPSS 0.58%

Source: NIST National Vulnerability Database (record CVE-2024-5739), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.