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Vulnerability record · CVE-2026-3861 · published 16 April 2026

CVE-2026-3861: Linecorp line vulnerability

Linecorp · Line

LINE client for iOS versions prior to 26.3.0 contains a vulnerability in the in-app browser where opening a crafted web page can repeatedly trigger OS-level dialogs due to insufficient safeguards when handling arbitrary URL schemes, potentially causing the iOS device to become temporarily inoperable.

7.1 CVSS 4.0 High EPSS 0.35% · top 74.5% CWE-451 · CWE-451
7.1CVSS 4.0 base score
0.35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
8 Jul 2026Last modified by NVD

Description

LINE client for iOS versions prior to 26.3.0 contains a vulnerability in the in-app browser where opening a crafted web page can repeatedly trigger OS-level dialogs due to insufficient safeguards when handling arbitrary URL schemes, potentially causing the iOS device to become temporarily inoperable.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

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

References

LinkTags
https://hackerone.com/reports/3422905 Permissions Required

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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-2026-3861), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.