What is CVE-2026-3861?

CVE-2026-3861 is a medium-severity vulnerability in Linecorp Line, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 6.5/10. Published 2026-04-16.

How severe is CVE-2026-3861?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Linecorp Line

CVE-2026-3861

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.

EPSS: 0.003 (22.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

Linecorp Line
Ly Corporation Line Client For Ios — versions 26.3.0

Weakness classification (CWE)

CWE-451 — User Interface (UI) Misrepresentation of Critical Information

References

dl_cve@linecorp.com (Permissions Required)

Frequently asked questions

What is CVE-2026-3861?: CVE-2026-3861 is a medium-severity vulnerability in Linecorp Line, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 6.5/10. Published 2026-04-16.
How severe is CVE-2026-3861?: Medium severity. CVSS v3 base score is 6.5 out of 10.