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Vulnerability record · CVE-2023-5554 · published 12 October 2023

CVE-2023-5554: Linecorp line improper certificate validation vulnerability

Linecorp · Line

Lack of TLS certificate verification in log transmission of a financial module within LINE client for iOS prior to 13.16.0.

9.8 CVSS 3.1 Critical EPSS 0.22% · top 89.0% CWE-295 · Improper certificate validation
9.8CVSS 3.1 base score
0.22%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

Lack of TLS certificate verification in log transmission of a financial module within LINE client for iOS prior to 13.16.0.

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

Affected products

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

References

LinkTags
https://hackerone.com/reports/2106827 Permissions Required
https://hackerone.com/reports/2106827 Permissions Required

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Related vulnerabilities

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

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%8.1CVE-2016-4850Linecorp line improper access control vulnerabilityLINE for Windows before 4.8.3 allows man-in-the-middle attackers to execute arbitrary code.EPSS 2.2%

Source: NIST National Vulnerability Database (record CVE-2023-5554), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.