What is CVE-2023-43300?

CVE-2023-43300 is a high-severity vulnerability in Linecorp Line. CVSS score: 8.2/10. Published 2023-12-07.

How severe is CVE-2023-43300?

High severity. CVSS v3 base score is 8.2 out of 10.

Vulnerability in Linecorp Line

CVE-2023-43300

An 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.

Published 2023-12-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (42.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Linecorp Line — versions 13.6.1

References

github.com/syz913/CVE-reports/blob/main/CVE-2023-43300.md (Third Party Advisory)

Frequently asked questions

What is CVE-2023-43300?: CVE-2023-43300 is a high-severity vulnerability in Linecorp Line. CVSS score: 8.2/10. Published 2023-12-07.
How severe is CVE-2023-43300?: High severity. CVSS v3 base score is 8.2 out of 10.