What is CVE-2024-31403?

CVE-2024-31403 is a medium-severity vulnerability in Cybozu Garoon, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2024-06-11.

How severe is CVE-2024-31403?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Auth bypass in Cybozu Garoon

CVE-2024-31403

Incorrect authorization vulnerability in Cybozu Garoon 5.0.0 to 6.0.0 allows a remote authenticated attacker to alter and/or obtain the data of Memo.

Vulnerability class: Broken Access Control

Published 2024-06-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (19.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Cybozu Garoon
Cybozu, Inc. Cybozu Garoon — versions 5.0.0 to 6.0.0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

cs.cybozu.co.jp/2024/007901.html (Vendor Advisory)
jvn.jp/en/jp/JVN28869536/ (Third Party Advisory)

Frequently asked questions

What is CVE-2024-31403?: CVE-2024-31403 is a medium-severity vulnerability in Cybozu Garoon, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2024-06-11.
How severe is CVE-2024-31403?: Medium severity. CVSS v3 base score is 5.4 out of 10.